ALBERT

Notes: SYNOPSIS. With the aid of electron microprobe analysis on ciliate spreads, we detected zinc in ciliates and its accumulation in the endoplasm. A correlation was found between the amount of zinc accumulation and its concentration in the medium. By the same microprobe analysis of ultrathin sections, we determined semiquantitatively the zinc accumulation in the intracytoplasmic granules and its presence in macronuclei and in intra- and extracellular bacteria.

Notes: SYNOPSIS. A Cryptobia sp. that appears to differ structurally from Cryptobia helicis Leidy occurred as 2 distinct populations within the spermatheca of the land snail Triadopsis multilineata (Say). Attached flagellates were a resident population within the spermatheca while pleomorphic, free-swimming forms were a transient population moving freely within the reproductive tract. Slender, free-swimming flagellates were apparently the ones transmitted by a venereal route. It was observed by electron microscopy that attachment was achieved through an extensive morphologic transformation of the first 5 to 10 μm of the anterior flagellum which resulted in the formation of numerous pseudopodium-like structures (“flagellapodia”) capable of invading the microvillus border of the host tissue. Flagellapodia were delimited by a single unit membrane, contained granular cytoplasm, and were long, branched, finger-like structures which interdigitated extensively with host cell microvilli. Fine structure of the Cryptobia sp. is distinctly different from that reported for C. helicis. the differences include structure and position of the preoral ridge, the cytostome-cytopharynx, the recurrent flagellum, and the presence of the flagellapodia.

Notes: Eighteen domestic turkeys naturally infected with Leucocytozoon smithi Laveran & Lucet were maintained on restricted feeding schedules under conditions of either continuous light or natural light (light 13 h:darkness 11 h) photoperiods. Peripheral gametocyte numbers of L. smithi in all turkeys were determined every 2 h over a 36-h period. Peripheral gametocyte numbers of turkeys maintained under continuous light and restricted to either a 10-h feeding period (9:30 p.m. to 7:30 a.m.) once a day or a 2-h feeding period twice a day (7:30 a.m. to 9:30 a.m. and 7:30 p.m. to 9:30 p.m.) increased at or near the time of feed availability. Under natural photoperiod, gametocyte periodicity was not affected by restricting feed availability to the dark phase of the light-dark cycle. Mean parasite numbers were highest during the light phase when feed was not available, and lowest during the dark period when feed was accessible.

Notes: Thirty newly excysted Spathidium spathula (Müller) and 60 newly excysted Spathidium muscicola (Kahl) were selected as progenitors of clonal daily reisolation lines that omitted both conjugation and encystment. Daily division rates were determined for each clone either until it died or until the end of the 170 days of reisolation. Both species had reduced fission rates as they accumulated fissions in the absence of macronuclear reorganization. Spathidium spathula had a significant reduction of daily fission rate after 100-120 fissions and S. muscicola after 20-30 fissions. Older clones of both species contained a noticeable proportion of abnormal organisms. A significant increase (10.5%) in daily fission rate occurred in aged sublines of S. spathula following conjugation (selfing) and its concomitant nuclear reorganization. Spathidium muscicota did not conjugate, but recently excysted sublines, compared to aged lines, had an increased daily fission rate.

Notes: Mitochondrial DNA (mtDNA) from endosymbiote-free stocks of Paramecium tetraurelia was isolated by 2 procedures. the buoyant density of the mtDNA in neutral CsCI was 1.702 gm/cm3. a value consistent with the melting temperature of the mtDNA. Only linear molecules were observed by electron microscopy. These molecules were homogeneous in size with a monomer molecular weight of 25.6 × 106 daltons. the size of the mtDNA determined after digestion with the restriction endonucleases EcoRI or Hind III agreed with the value obtained by electron microscopy. These studies also revealed that the digestion pattern of mtDNA from stock 172 differed from that of the other 3 stocks (51, 127. 203) examined. Some mtDNA molecules exhibited snapback reassociation following denaturation.

Notes: RESUME L'étude détaillée du cortex et des organelles buccaux de Cyrtolophosis mucicola montre que ce Cilié possède une organisation structural corticale comparable à celle de Woodruffia, Platyophrya, Kuklikophrya et des Colpoda. Tout en restant conforme au plan général d'organisation de ces derniers, il a des variations spécifiques décelées au niveau des organelles buccaux qui confirment la position de C. mucicola dans la famille des Cyrtolophosididae, incluse dans le sous-ordre des PLATYOPHRYINA.

Notes: ZUSAMMENFASSUNG Als Kineten werden in dieser Arbeit die intra- und extrazellular in der Hamolymphe sowie im Ovar (ein-schlieBlich der Oocyten und Eier) der Ubertragerzecken auftretenden motilen Entwicklungsstadien (“vermikuli”) der Babesien bezei-chnet. Kineten von Babesia bigemina Smith & Kilborne, in der Hamolymphe von Boophilus microplus Canestrini, wurden ultramor-phologisch und ultra-enzymcytochemisch (saure Phosphatase, saure unspezifische Esterase) untersucht. Kineten von Babesia ovis (Babes) Starcovici in Hamolymphe und Ovar von Rhipicephalus hursa Canestrini & Fanzago wurden im wesentlichen ultracytochem-isch untersucht. Die Pellikula der Kineten von B. bigemina ist komplex und aus 3 Membranen zusammengesetzt (Pellikularkomplex): einer auBeren Membran (dem Plasmalemma) und 2 inneren dicht aufeinander liegenden Membranen. Die auBere Membran ist ˜8 nm dick und offenbar von einer strukturlosen Schicht von ˜3 nm Dicke bedeckt. Jede der beiden inneren Membranen ist ˜6 nm stark. Der Abstand zwischen der inneren Doppelmembran und dem Plasmalemma betragt 7,5 nm. Die Gesamtstarke des Pellikularkomplexes wurde mil 30 nm gemessen. Die beiden Innenmembranen der Pellikula sind wahrscheinlich Abkommlinge des endoplasmatischen Retikulums (ER), und zwar aus folgenden Griinden: (a) sie schliefien eine Lage hydrolase-aktiven Materials ein; (b) in sich intraha-mocytar aus Kinenten transformierenden spharoiden Stadien wird die innere Doppelmembran der Pellikula augenscheinlich durch eine ER-Cisterne ersetzt; (c) die Dicke der Innenmembran entspricht ziemlich genau jener der ER-Membran. In der pellikularen Doppelmembran befinden sich zirkulare Offnungen unterschiedlichen, durchschnittlich 100 nm weiten Durchmessers. Trotz ihrer Ahnlichkeit mil Mikroporen (die fur den Pellikularkomplex der Apikomplexa charakteristisch sind) zeichnen sich diese Differenzierungen durch einen ganz spezifischen Bau aus. Sie werden hier daher Intrapellikularfenster (IPF) oder Pseudomikroporen genannt. Der Rand eines IPF ist eine Kante, die durch die hier ineinander umschlagenden inneren Pellikulamembranen gebildet wird. Dieser Umschlagkante ist cytoplasmatisches, elektronendichtes Material angelagert. Anders als bei einem Mikroporus ist das Plasmalemma jedoch nicht inva-giniert. In Tangentialschnitten erscheint ein IPF als einzelner, dunkler Ring. Manchmal sind den IPF Rhoptrien assoziiert. Eine den IPF ahnliche, jedoch viel weitere intrapellikulare Offnung befindet sich am Apex des Parasiten. Ihr Rand ist mil der inneren Offnung-skante des Apikalringes kongruent. Typische subpellikulare Mikrotubuli wurden nicht beobachtet.Der Apikalkomplex der Kineten von Babesia besteht aus dem Apikalschirm, einem darunter beflndlichen Kranz aus Mikrotubuli, und Rhoptrien. Mikronemen sind ebenfalls zahlreich vorhanden. Der Apikalschirm liegt unmittelbar unter der Pellikula und ist bei Kineten von B. bigemina eine speichenradahnliche Struktur, bestehend aus radiar an einem radnabenahnlichen zentralen Ring (Api-kalring) entspringenden “Rippen”. Es sei betont, daB der Apikalschirm nicht Teil der Pellikula ist und der Apikalring somit nicht identisch ist mil der iiblicherweise als Polring beschriebenen Struktur. Unter jeder “Rippe” des Apikalschirms verlauft ein Mikrotubulus (= subkostaler Mikrotubulus). Bei Kineten von B. ovis sind die “Rippen” viel weniger ausgepragt. In Oocyten und Eiern weisen sie auBerdem einen konisch zugespitzten Apikalschirm auf. Die Rhoptrien der Babesia-Kineten sind spindelformig und im wesentlichen unter dem Apikalschirm lokalisiert. Sie sind in radiaren Reihen arrangiert, wobei jede Reihe einer “Rippe” zugeordnet ist. Ein Conoid wurde nicht gesehen. Hydrolytische Aktivitat in Spuren wurde gelegentlich in Mikronemen beobachtet. Rhoptrien und Apikalschirm waren stets frei von Phosphatase- und Esterase-Aktivitat.Hinsichtlich ihrer fundamentalen morphologischen Organisation und hydrolytischen Aktivitat zeigt die Pellikula der Kineten von Babesia iiberraschende Ubereinstimmung mit dem Pellikularkomplex der Coccidien. Sie unterscheidet sich von diesem durch die IPF und das Fehlen von Mikroporen (sowie typischen subpellikularen Mikrotubuli). In der Komplexitat der Pellikula sowie vor allem in bestimmten Strukturdetails des Apikalkomplexes (Apikalschirm, Fehlen eines Conoids) sind die Babeji'a-Kineten jedoch auch den Hamosporidien bemerkenswert ahnlich.

Notes: SYNOPSIS. the pattern of RNA synthesis of intracellular Trypanosoma cruzi amastigotes, immediately following infection of Lesch-Nyhan human fibroblasts, was studied by autoradiography. Amastigote RNA synthesis, determined by [3H]guanine incorporation, was not detected until 2 h after infection. At 8 h postinfection more than 90% of intracellular amastigotes were labeled. It was verified that extracellular trypomastigotes also synthesized RNA. Therefore it was concluded that, if RNA is required for trypomastigote-to-amastigote transformation, this nucleic acid is already present in the trypomastigotes before infection of the vertebrate cell. It is probable that the RNA synthesized by amastigotes during the prereplicative lag period (the period between initial infection and the onset of DNA synthesis) is required for intracellular growth and reproduction.

Notes: SYNOPSIS. Surface proteins of Tetrahymena were identified by lactoperoxidase iodination, and comparisons were made between a number of strains and species within the genus. an adequate procedure for strain comparisons was found to be solubilization of whole cells following iodination, separation of total cell protein using polyacrylamide gel electrophoresis, and identification of surface proteins by autoradiography of dried gels. the results obtained in the present study show the existence of both interspecific and intraspecific variation in surface proteins of Tetrahymena, but the differences tend to be small within species and large between species. the relation of these cell surface fingerprints to the present taxonomic designations within the genus is discussed. Questions are raised about the functional significance of these surface proteins.

Notes: Examination for coccidia of 20 domestic sheep (Ovis aries) from a farm in Rome Province revealed the following 5 species: Eimeria ahsata Honess, E. intricate Spiegl, E. ovina Levine & Ivens, E. ovinoidalis McDougald, and E. parva Kotlàn, Mócsy & Vajda. of these species, only E. ahsata was not previously reported in Italy. For this reason, a description of this coccidium and a statistical analysis of size differences between E. ahsata and E. ovina are given.

Notes: The following gregarines are described from mosquitoes in Taiwan: Ascocystis culicis (Ross) from Aedes aegypti (Linnaeus), Ascocystis taiwanensis sp. n. from Aedes albopictus (Skuse), Ascocystis lanyuensis sp. n. from Aedes alcasidi Huang, and Ascocystis armtgerei sp. n. from Armigeres subalbatus (Coquillett). the gamonts of all species are in the lumen of the midgut of the larvae, and the gametocysts and oocysts in the lumen of the Malpighian tubules of the pupae and adults. Ascocystis culicis matured only in Aedes aegypti and Aedes desmotes (Giles); Ascocystis taiwanensis only in Aedes albopictus and Aedes alcasidi; Ascocystis lanyuensis only in Aedes alcasidi; and Ascocystis armigerei only in Armigeres subalbatus and Aedes alcasidi.

Notes: Spores of Chloromyxum trijugum Kudo from Lepomis macrochirus Rafinesque and Chloromyxum catostomi Kudo from Notropis dorsalis (Agassiz) were obtained from infected gall bladders, glass-bead sonicated, and examined by scanning electron microscopy. Valves of C. trijugum spores each have a thick ridge running parallel to the sutural ridge. Uncapped cnidocyst pores open into the extrasutural ridges. A pyriform structure of unknown function was observed at the posterior surface in some spores. Spore valves of C. catostomi are sculptured with ridged striations running in various parallel and converging patterns over the entire surface. Cnidocyst pores open into ridges adjacent to the sutural plane. Glass bead sonication was found effective in polar filament extrusion. Discharged filaments were twisted along the long axis and partially coated with mucoid globules.

Notes: A nutrient-agar method without liquid overlay has been developed for cultivation of ciliates. Three species of Tetrahymena-T. pyriformis strain W, T. rostrata strain UNI, and T. vorax strain V2S, representing the 3 main groups of Tetrahymena species, were used; however the method should apply to other ciliates. Growth on the surface of the agar was facilitated by an optimal surface-to-volume ratio yielding a high density of ciliates (5.8 × 105 cells/cm2 for T. pyriformis at 25 C) and short generation times (3 h for T. pyriformis at 30 C). At the highest density achieved, the cells became irregularly hexagonal and formed a monolayer “tissue” on the agar. Ciliates grown on agar were like those in liquid culture, typical oral ciliature, food-vacuole formation, and typical cortical patterns being retained. Advantages of this method include high cell density, easy recovery, and optimal O2 supply. the organisms can also be cultivated on the surface of sterile cellulose-nitrate filters, facilitating in situ fixation and staining as well as transfer into different media by transfer of filters with cells, without prior centrifugation and resuspension.

Notes: Ergosterol was the only sterol detected in Herpetomonas samuelpessoai grown in a defined, lipid-free medium. When cultivated in a complex medium, this flagellate was found to contain 6 additional sterols. As measured by incorporation of L-[Me-14C]methionine, in the absence of acetate, the sterol synthesis was greater at 28 C than at 37 C; in the presence of acetate, however, this synthesis was greater at 37 C. When [2-14C]acetate was used as the sterol precursor, the synthesis level at 37 C exceeded that at 28 C.

Notes: SYNOPSIS The time is ripe for protozoan ecologists to begin the general evaluation of the role of food quality in the energy transformations and materials flow in food webs involving protozoa and other small organisms. Current evidence suggests that major pathways of energy flow at any particular time depend upon the matches between prey species and consumers. There are 2 components to food quality related (informational) energy flow: (a) the information present in the molecular constitution of the prey; and (b) the ability of the protozoa to recognize and use it. If the evidence obtained from trophodynamic studies of 2 marine ciliates, Uronema marinum Dujardin and Euplotes vannus Müller indicates a generalized ability of protozoa to regulate catabolic reactions to points which optimize energetic gains from their food, then it may be one of the keys to the evolutionary successes of the group.

Notes: SYNOPSIS Litters and soils are special interstitial ecosystems containing water in surface films and pore spaces, large amounts of organic matter, and are subject to extreme moisture and temperature fluctuations. “Terrestrial protozoa” are ubiquitous limnetic species tolerant of high CO2 tensions and possessing efficient encystment mechanisms.Protozoa exploit tiny microhabitats unavailable to larger animals (e.g. nematodes). Naked amebae dominate due to their flexible bodies and interface locomotion. Small flagellates may be abundant, especially in litters. Ciliates are less numerous but their species composition indicates the degree of moisture of the habitat, as do the slower-growing testacea which become prominent in regions of slow decomposition (conifer and tundra biomes). Protozoa promote decomposition by enhancing bacterial metabolism, eating excess bacteria, and excreting simple compounds returnable to plants. Large populations, especially amebae, exploit the abundant bacterial flora of plant root zones (rhizosphere). One protozoon, Colpoda cucullus, has successfully invaded the surfaces of vegetation.

Notes: SYNOPSIS Interacellular membrane potential and spontaneous changes associated with motile responses in the zooid of Vorticella convallaria Linnaeus were recorded by conventional electrophysiological technics. an all-or-none large transient depolarization (large pulse) occurs in association with a spontaneous contraction of the zooid. A small transient potential change (small pulse) was observed in association with periodic contraction of the contractile vacuole.

Notes: SYNOPSIS Deer mice Peromyscus maniculatus (Wagner) were trapped near Hammett, Idaho, as a possible source of Besnoitia jellisoni Frenkel and species of Sarcocystis to be used for life cycle studies. Forty-nine deer mice were necropsied; 20 (40.8%) were positive for sarcocysts structurally identical with those of Sarcocystis idahoensis sp. N. the source of S. idahoensis used for life cycle studies was a Great Basin gopher snake Pituophis melanoleucus deserticola Stejneger killed near Hammett, Idaho; 20 sporulated sporocysts measured 11.1 × 13.4 (11-12 × 13-14) μm. Structurally identical sporocysts were found in 7 of 14 Pacific gopher snakes P. m. catenifer (Blainville), and in 6 of 10 San Diego gopher snakes, P. m. annectens Baird & Girard. Totals of 148 deer mice and 17 gopher snakes were necropsied in the course of life cycle studies. Development of the first generation meronts took place within the hepatocytes of deer mice 2-10 days post-inoculation (PI) with sporulated sporocysts. Rosette-shaped meronts (6-8 days PI) contained tachyzoites attached by their posterior poles to a residual body. After release from the residual body, tachyzoites were initially retained in a meront wall and later released from the hot cells Within muscle cells a single tachyzoite-shaped structure was found 11 days PI and PAS-negative metrocyte-containing sarcocysts (2nd generation meronts) 13-34 days PI. PAS-positive material was first seen in sarcocysts 34 days II at which time bradyzoite formation became apparent. At 160 days PI, 10 sarcocysts measured 0.4 × 5.8 (0.2-0.9 × 1.8-9.9) μ and appeared to be mature and structurally identical with those from naturally infected deer mice. After ingestion of S. idahoensis-infected deer mice by gopher snakes, bradyzoites developed directly into microgamonts and macrogametes. These stages were first seen 5 days PI. Microgamonts were generally located above and macrogametes below the epithelial host cell nucleus. Seven to 11 days PI microgamonts were seen with mature microgametes, and oocysts which had not yet begun sporogony were found with oocyst walls. Clinical signs of illness were generally not observed in infected gopher snakes; however, one snake developed anorexia and cachexia, and became moribund after repeated ingestion of heavily infected deer mice. Acute hepatitis associated with developing meronts often was noted in deer mice given over 15,000 sporocysts each. Five to 6 days PI anorexia, weakness, ataxia, and dyspnea were observed: these clinical signs increased in severity until 6-8 days PI, when mice became recumbent and died, or were killed while moribund. Hepatosplenomegaly, petechial hemorrhage o the serosal and cut surfaces of the liver, and icterus were common. Diffuse coagulative necrosis with cellular infiltration (primarily neutrophils) was noted on microscopic examination.

Notes: SYNOPSIS Catalase activity of Paramecium tetraurelia decreased during autogamy and recovered to normal 5 days later. Autogamy also caused changes in the ciliate's sensitivity to natural ionizing radiations—the decrease in cell growth rate previously described in shielded cultures did not occur when autogamous cells were used. Maximum effect of shielding was observed in 11-day-old postautogamous cells. the role of the catalase in the mechanism of natural irradiation effect is discussed.

Notes: This paper explores the choices and potential biases involved in valuing one type of government expenditure, medical transfers, and in estimating its antipoverty impact. Three methodological approaches–(a measure of) government costs, (a measure of) cash-equivalent values and (a measure of) funds released–are contrasted both in concept and in practice. We assign benefits to individuals after assuming that Medicare and Medicaid provide insurance to all those who are eligible. The resulting estimates for 1968 and 1974 illustrate the efficacy of these medical transfers in reducing the number of persons in poverty. Two recent studies, one by the Congressional Budget Office, and the other by Morton Paglin, further highlight the importance of medical transfers for estimating poverty, despite the fact that we do not wholly agree with the methodologies which they employ. Our results indicate that in the aggregate, while medical care transfers have a substantial impact on poverty, the choice of a specific estimation approach has little effect on poverty estimates. However, for the elderly and possibly also for other groups (e.g. the rural poor), choice of estimation technique is quite crucial for estimating the extent of poverty.

Notes: In studies of income distribution household income is the common measure of household welfare, although household per capita income is better since it automatically “corrects” for household size. Perhaps the continued use of the former is a consequence of the belief that in practice the two give very similar results. This paper shows that in many cases those results differ substantially. Policy prescription based on household income rather than household per capita income can be very defective. The paper compares results according to the two income concepts for Malaysian data. U.S. data are then used in a comparison over time.The disparity between the two Malaysian distributions is illustrated by their cross tabulation. A quarter of the households in the lowest forty percent of the household income distribution is in the upper three quintiles of household per capita income; and 10 percent of the same lowest forty are in the highest two quintiles of the second distribution. The paper also shows that the distribution of benefits from public education-measured as the public costs of school years—is very inegalitarian if household income is used. The reverse occurs if household per capita income is used. Similar reversals occur in comparisons involving partitions by occupation and sex of head of household. Women-headed households, for example, have sub-mean household incomes but their household income per capita equals the mean. The paper also examines the differences in the age-income profiles of the two distributions. It then considers whether the much discussed secular stagnation in U.S. measures of inequality is changed if household income per capita is used rather than the usual household income measure. Use of the per capita concept results in a slight decrease in U.S. inequality between 1947 and 1972. Appendix 2 explores how long term growth in per capita incomes and the associated changes in the size composition of households may affect measurements of inequality.

Notes: Provision of “market goods” follows the decision rules of traditional microeconomics; pricing and resource allocation for such goods tend towards Pareto optimality. The provision of “collective goods,” by contrast, depends on political (or quasi-political) collective decision processes; beneficiaries often receive a share of collective goods free of charge or well below average or marginal (private or social) costs. No inherent tendency towards optimality may be presumed and separate analysis of collective goods becomes an essential part of national goals accounting.The national-income-accounts (NIA) distinction between personal consumption expenditures (PCE) and government purchases of goods and services corresponds roughly to a division between market goods bought by the consumer and a major category of “collective goods” (i.e. “public goods” provided by government). However, a significant proportion of PCE represents “collective goods” paid for by government, business, or nonprofit organizations and provided on behalf of the consumer, whereas a part of NIA government purchases represents services paid for by the consumer (i.e. “market goods”).This article develops operationally meaningful distinctions among “market goods,”“collective goods,” and “tied aid” (a mixed category with market-good and collective-good characteristics). These distinctions are determined by the nature of the decision processes–rather than by the characteristics of the beneficiary or the supplier. This classification is related to the national income accounts and major discrepancies are pinpointed. The blurring of the distinction among market goods, collective goods and tied aid is found to be most consequential in the NIA treatment of “education” and “medical care” services. NIA data for these two services are restructured for national goals accounting purposes in order to illustrate both the quantitative importance and the empirical feasibility of classifying benefits by their respective decision processes.

Notes: Recently there has been discussion concerning the renewal of the volume measurements of public sector services. This renewal has been proposed e.g. in the recent United Nations Draft Manual on Public Sector Statistics. In the present paper we discuss some theoretical and practical problems connected with this renewal. According to some preliminary calculations concerning the Finnish educational sector, the new methodology might lead to a considerable revision of figures of output and labour productivity in the public sector. The revisions are of such a quantity that they might cause significant changes in the measurement of the volume of the total gross domestic product. This is a fact which may still require reflection before the new methodology is generally introduced, even though the revisions as such may be highly desirable from several aspects.

Notes: Structural relationships estimated from data obtained in a benchmark study of the expenditures and prices of 16 countries are used to develop a table of real gross domestic product and shares of gross domestic product devoted to private and public consumption and investment for each of over 100 countries in the years 1950 and 1960 through 1977. Price level estimates for total product and the three components are also provided.

Notes: Taxes as well as government expenditures tend to transform income distribution; the higher they are in relation to GDP, the higher their potential influence appears. It is easier to trace the incidence of taxes than that of expenditures and studies of effects of expenditures on income distribution are not frequent. Changes of fiscal legislation and deficiencies in reporting systems and statistics frequently found in developing countries complicate the task still further.An investigation of this type in a developing country has to face a poorly developed data base and take advantage of different and dispersed sources of information.This paper presents the methodology used for estimating the influence of government expenditures a n income distribution in the case of Venezuela. Although the incidence of fiscal activities on income distribution in Venezuela might not necessarily be the same as in other countries, Venezuelan sources of information are not very different from those existing in other countries of similar level of economic and statistical development and procedures used could appropriately be adapted to other countries.

Notes: The question addressed in this paper is: Why can't we have a good measuring rod of the economic and social performance of our society? The answers are basically positive but lie mostly in the direction of (1) avoiding simplistic solutions such as turning the national income accounts into a measure of social welfare and (2) providing the elements of an information strategy to obtain such a measure or more accurately such a set of measures.The proposed information strategy highlights five activities: (1) the presentation and analysis of welfare outcomes, an activity which is analogous to but broader than “social indicators”; (2) social accounting which includes economic accounting, demographic accounting, and time-use accounting; (3) model building and operation which, unlike accounting, are concerned with behavioral or causal relationships used to explain and project welfare outcomes; (4) hypothesis testing to develop new insights into economic and social behavior; and finally (5) the building and maintenance of a data base required for carrying on the aforementioned four activities.

Notes: The importance of non-personal shareholders in Malaysian corporations is widely acknowledged. However, up till now, very little has been known about the nature of these shareowners, their manner of equity ownership (especially their size of holdings hence degree of share concentration), their country of incorporation and how they themselves are controlled i.e. whether Malaysian or foreign. This paper attempts to fill this gap with data compiled from official shareholders' lists of the largest ninety-eight Malaysian incorporated companies engaged in manufacturing, for a point in time 1975–75, which is towards the end of the Second Malaysia Plan period. Some of the empirical findings are then compared with those of a few selected countries.

Notes: This paper deals with the influence of differing methods of deflation on the international terms of trade of the Federal Republic of Germany. The question to be discussed is what indices seem best suited for the deflation of exports and imports in national accounts. It will be shown that the use of alternative price indices for deflating exports and imports leads to considerable differences of the results at constant prices and so in terms of trade. In addition, terms of trade are presented by groups of countries.

Notes: Two ways of estimating the value of housework are currently used. One is the opportunity cost approach, which sets the value of work done at home equal to the income the person could earn in the labor market. The other is the market cost approach, which uses the cost of hiring someone to do the housework to determine its value. In this study we use data on earnings of female clerical workers with various patterns of labor force participation to obtain estimates of the opportunity cost of hometime for such women. We find that potential market earnings do not provide an acceptable estimate of the value of housework, and suggest that using the wages of general household workers is a better approach.

Notes: By expenditure on education, health, housing and other public services, governments provide many goods and services which are alternatives to, or additional to, household expenditure on consumption. In most Western national accounts, the two forms of consumption are rigidly separated. Yet the combination of the two–the concept of total household consumption–has obvious importance for the measurement and comparison of living standards and for the formulation and analysis of policy. This concept is recommended as an additional aggregate in the revised SNA. It is displayed in the UN International Comparison Project (ICP). It is used as a major aggregate (“total consumption of the population”), although hitherto generally excluding nonmaterial services, in the Material Product System. Yet it is rarely shown explicitly in Western national accounts. One reason is the slow progress in the analysis by purpose of government expenditure.This paper shows how far figures of total household consumption, and of its division between collective and private consumption, can in fact be derived, for the advanced countries, from the data provided to the UN Yearbook of National Accounts, supplemented b y the ICP. The results show first the wide national variations in the relation between the two forms of consumption but, secondly, the gaps in information on this crucially important topic. The relation between direct government expenditure for collective consumption and transfer payments to households (“social income”) is also examined. High and low levels of these two forms of State support to consumption reinforce each other almost as often as they offset each other. But, again, the data provided by national accounting statistics are very incomplete.This paper was prepared for the 16th General Conference of the IARIW, August 1979.

Notes: In an earlier paper, we presented estimates of capital gains for a number of categories of assets owned by Belgian households. The purpose of the present paper is to see how the distribution of disposable income between socio-economic groups is modified when one adopts a “broadened” definition of income which includes capital gains corrected for losses of purchasing power.The main result of the study is that at current prices, the adoption of a broadened definition of income strongly increases disparities between socio-economic groups. However, when one takes into account losses in purchasing power, conclusions differ according to the period analyzed. For the years 1953–68, it appears that the distribution of broadened disposable income is more unequal than the distribution of disposable income. For the years 1969–77 when inflation was high, the adoption of a broadened definition of income has reduced disparities, with the important exception of old age pensioners.

Notes: International financial relationships should be interpreted in the context of a comprehensive conceptual framework; this paper advocates the use of concepts developed to measure and analyze balance of payments flows. Broad-based, empirical estimates of the international wealth of most countries of the western world are presented on the basis of cumulating balance of payments flows over a lengthy period. Among the more interesting aspects of the results are: the importance of intra-industrial country capital flows in a global context; the propensity of debtors to regard a larger share of their aggregate external debt as long term than do their creditors; the overwhelming importance of banks located in the industrial countries in global external asset and liability positions, and the preponderance of short-term positions taken by those banks; and the tendency for balance of payments records to report more direct investment assets than liabilities. The paper also contains some observations, based on the cumulations of balance of payments capital flows, concerning the nature and size of certain deficiencies in alternative sources–particularly the World Bank's Debtor Reporting System, and the Bank for International Settlements' banking data–of information on outstanding external debt positions.

Notes: The unsolved problems of measurement of international transactions may have consequences which are serious both for policymakers and for those undertaking research. Emphasis is placed on the need for users of data to understand and take into account the limitations and qualifications attached to them.The causes of deterioration in the quality of estimates of international transactions likely lie in their changing pattern. After a brief discussion of the basic sources and methods used, the paper selects for comment possible measurement problems related to inflation, taxation, illegal transactions, and affluence.A description follows of the improvement to data which has been achieved through exchanges and comparisons between trading partner countries. Efforts to use econometric analysis to point to error sources have, however, proved less rewarding.The paper concludes with a section on the linkage of flow and stock estimates.

Notes: Although the functional and institutional distributions of income are integrally connected to individual living standards and other development policy objectives, these dimensions are rarely given prominence or even accommodated within standard national accounting frameworks. This paper summarizes research on the estimation of a social accounting matrix (SAM) for Malaysia for 1970 in which the distribution of income between different factors and socio-economic groups is identified. It is the latest of a series of case studies involving some of the authors and is, perhaps, the most detailed of its kind. The study departs from the United Nations SNA guidelines at various points. The SNA basically proposes a commodity balance approach to national income accounting. In giving equal emphasis to income/outlay accounts as to the production accounts, the present study has brought together data from two major primary sources: a household expenditure survey and a production survey. Their combination poses several problems which are discussed in the paper. It leads to an integrated picture, in matrix form, of the interrelationships between income distribution and production structure in the Malaysian economy.Both the factor and household accounts in our SAM are disaggregated according to race and the geographic distinction between Peninsular and East Malaysia, with an urban/rural split within Peninsula Malaysia. The Peninsula labor force is further disaggregated by education level, while its households are then subdivided according to the employment status of main income earners. Arguments for and against these choices are presented.Some other aspects of the study can be noted. First, the distinction drawn between East and Peninsular Malaysia is desirable not only because of the inherent interest of the regions but also because of large differences in data availability and hence in estimation methods. Secondly, to complete our SAM it was necessary to estimate inter-household transfers, being the institutional analogue of inter-industry commodity flow. And finally an attempt has been made to impute the labor component of unincorporated business income. These, then, are the major problems which had to be overcome in our attempt to quantify the generation, distribution, and redistribution of income within Malaysia in a SAM framework.

Notes: The development of social protection accounts is described and the relationship between social security and welfare expenditure (as recorded in social protection accounts) and expenditures in the national accounts is discussed. Proposals are put forward for achieving co-ordination between social protection expenditure and expenditure recorded in the national accounts, and these are illustrated by reference to Irish data. The future development of social protection accounts by the inclusion of fiscal benefits, which are not recorded in the national accounts, is also considered. Finally some references are made to the use of the social protection accounts and the development of data relating o the numbers of persons covered by social protection and the numbers of beneficiaries.

Notes: This paper analyses the weakness in labour demand which appeared in 1973–78 in France, Germany, and the U.K. and attempts a comprehensive assessment of it. Hitherto, the situation in labour markets has usually been measured by official figures of the registered unemployed which tend to understate unemployment itself and neglect other dimensions of labour slack, such as reversal of previous migration flows or declines in labour force participation or in working hours which may contain highly significant cyclical movements cushioning unemployment.The report proposes the adoption of a more comprehensive concept for labour market monitoring, along lines already used in the annual reports of the German Institute of Employment Research. Such an approach presents advantages in economic and labour market policy analysis. A simplified form of the proposed monitoring tables is presented in Annex Tables F-1 to F-4, G-1 to G-4 and U-1 to U-4. They can be considered as a potential satellite to existing national accounts.It is also suggested that analysis of the degree to which labour potential is used be conducted on a regular basis. The possibilities of this approach are outlined in considerable detail in Section V and in the annex. The different dimensions of the use-of-potential account are summarised in Table 3.The report contains a review of the literature on the full employment rate of unemployment and its components. This is one of the major issues on which a judgement must be made in use-of-potential analysis. This review is presented in Section VI of the report.It emerges from the analysis that Germany had the biggest labour slack (8.6 percent of potential) in 1978 though its unemployment rate (3.8 percent of the labour force) was the lowest of the three countries.

Notes: In this paper, I have examined the relative growth rates of personal consumption, government consumption, and national income in Russia from 1885–1913 and have contrasted them with the “European” model (derived from the U.K. and German experience). Two hypotheses of the conventional model of Russian industrialization were tested: the retarded growth of personal consumption and the accelerated growth of government consumption and investment (relative to the European model) and the growing Europeanization of Russian growth after 1906. The estimates of personal consumption and government consumption failed to sustain either hypothesis. In fact, the reverse hypotheses appear to be more plausible. The lack of data on investment prevented the testing of the investment hypothesis, but the limited evidence which is available does not point to an extraordinary growth of investment. As a final experiment, the combined growth rates of personal and government consumption were compared with a revision of Goldsmith's national income estimates. They were shown to provide strong support for the accuracy of the revision of Goldsmith's estimates.

Notes: From a survey of the 150 members of the United Nations it appears that only one country could at present provide the full range of balance-sheet statistics called for in the United Nations guidelines on this topic. Seven countries could compile balance sheets confined to conventional types of assets and liabilities–excluding assets like consumer durables and mineral deposits. A further 31 countries presently publish some statistics on certain balance sheet items, but as the data have generally not been collected with a view to constructing national balance sheets they tend to be deficient for such purposes both in coverage and valuation. In other countries only rather trivial kinds of balance-sheet data are available, such as certain banking statistics collected by the central monetary authority for purposes of bank regulation.A review of sources and methods shows that for financial assets and liabilities extensive use is made of company accounts and enterprise surveys. The estate multiplier method is used in several countries for measuring household assets and net worth. As regards producers' fixed assets, countries with centrally-planned economies generally take direct surveys of assets, while in countries with market economies the perpetual inventory method is preferred.It is noted that many of the purposes for which balance-sheet statistics are used can be adequately served without constructing a complete set of accounts. To date balance-sheet statistics have therefore tended to be developed in a piecemeal fashion with priority going to those parts of the accounts whose uses for economic analysis are most obvious. Chief among these are statistics on the financial assets and liabilities of corporate enterprises and statistics on the stock of producers' fixed assets. These two areas also predominate in countries' plans for the future development of balance-sheet statistics.

Notes: The view is expressed that the well-known formulae for measuring changes in terms of trade cannot be used to conclude whether a country is better off or not. Other variables which reflect the impact upon production, employment, and the competitive position should also be taken into account.Similarly, changes in terms of trade between the industrial sectors of an economy cannot be used to conclude whether one sector is better off than others. Other factors which play a role include increases in productivity per man-hour. These may help to explain why in some sectors prices increase less than in others. An attempt is made to illustrate this point using some statistics for the Netherlands.

Notes: The purpose of this paper is to examine and attempt to solve a longstanding “puzzle” in national economic accounting. Radio and television broadcasting are services clearly designed for and used by consumers but not purchased by them and, consequently, not counted in personal consumption expenditures (PCE); the costs of broadcasting (and a part of the costs of newspaper and magazine publication) are not counted in final product but are counted as intermediate expenses in the manufacture and distribution of advertised products. An important result of this treatment is that an increase in broadcasting services will not increase real product, but will be reflected as price increases in advertised goods. Are consumer services provided by advertisers properly handled in the conventional accounts? How should they be valued? If their value is to be added to PCE, where does the offsetting income originate?The paper argues that the puzzle is resolved by recognizing the nonmarket exchange between the consumer and the broadcaster; the consumer provides the reception and display of audiovisual advertisements in his home in return for broadcast entertainment. The exchange rate-e.g. 501/2 minutes of entertainment for 91 minutes of commercial messages in “prime time”-is established in the United States by the National Association of Broadcasters. Similar exchanges occur between consumers and radio broadcasters, newspaper and magazine publishers. This concept is used as the basis for a new treatment shown in abbreviated sample accounts. Estimates for the U.S. in 1976 are included.

Notes: Book review in this article:P Townsend. Poverty in the United Kingdom

Notes: Book review in this article:C D Harbury and D M W N Hitchens, Inheritance and Wealth Inequality in Britain, (George Allen and Unwin.)

Notes: We present a new method for the extraction and removal of the source wavelet from the reflection seismogram. In contrast to all other methods currently in use, this one does not demand that there be any mathematically convenient relationship between the phase spectrum of the source wavelet and the phase spectrum of the earth impulse response. Instead, it requires a fundamental change in the field technique such that two different seismograms are now generated from each source-receiver pair: the source and receiver locations stay the same, but the source used to generate one seismogram is a scaled version of the source used to generate the other. A scaling law provides the relationship between the two source signatures and permits the earth impulse response to be extracted from the seismograms without any of the usual assumptions about phase.We derive the scaling law for point sources in an homogeneous isotropic medium. Next, we describe a method for the solution of the set of three simultaneous equations and test it rigorously using a variety of synthetic data and two types of synthetic source waveform: damped sine waves and non-minimum-phase air gun waveforms. Finally we demonstrate that this method is stable in the presence of noise.

Notes: In this paper a theorem is demonstrated which allows—after the introduction of a suitable dipole kernel function or dipole resistivity transform function—to write the apparent resistivity function as an Hankel transformable integral expression.As a practical application of the theorem a procedure of quantitative interpretation of dipole soundings is suggested in which the dipole resistivity transform function obtained after inversion of the original dipole apparent resistivity data is used to control the goodness of the set of layering parameters which have been derived with our previous method of transformation of dipole sounding curves into equivalent Schlumberger diagrams.

Notes: The Hankel transform theorem can be applied to the inversion of gravity data for the buried sphere, the horizontal cylinder, and the vertical rod. This new approach leads to exact solutions of the transforms for the assumed bodies. A comparison with the classical procedure by Fourier transform reveals that for the sphere and the vertical rod, the Hankel transform is preferable.

Notes: Air guns have been used in various applications for a number of years. They were first used in coal-mining operations and were operated at up to 16000 psi charge pressures. Later, single air guns, operated at 2000 psi, found application as an oceanographic survey tool. Air gun arrays were first used in offshore seismic exploration in the mid-1960's. These early arrays were several hundred cubic inches in total volume and were operated at 2000 psi; they were either tuned arrays or several large guns of the same size with wave-shape kits. Today's arrays have total volumes greater than 5000 cu in. and are typically operated at 2000 psi. Recently, higher-pressure, lower-volume arrays operated at 4000–5000 psi have been introduced; guns used in these arrays are descendants of the coal-mining gun.On first thought one would equate increased gun pressure linearly with the amplitude of the initial pulse. This is approximately true for the signature radiated by a “free-bubble” (no confining vessel) and recorded broadband. The exact relation depends on the depth at which the gun is operated; from solution of the free-bubble oscillation equation, the relation is 〈displayedItem type="mathematics" xml:id="mu1" numbered="no"〉〈mediaResource alt="image" href="urn:x-wiley:00168025:GPR700:GPR_700_mu1"/〉 If Pc,1= 6014.7 psia, Pc,2= 2014.7 psia and PO, 1=PO, 2= 25.8 psia (corresponding to absolute pressure at 25 ft water depth), then 〈displayedItem type="mathematics" xml:id="mu2" numbered="no"〉〈mediaResource alt="image" href="urn:x-wiley:00168025:GPR700:GPR_700_mu2"/〉 Experiments were conducted offshore California in deep water to determine the performance of several models of air guns at pressures ranging from 2000 to 6000 psi and gun volumes ranging from 5 to 300 cu in. At a given gun pressure, the initial acoustic pulse Pa correlated with gun volume Vc according to the classical relation 〈displayedItem type="mathematics" xml:id="mu3" numbered="no"〉〈mediaResource alt="image" href="urn:x-wiley:00168025:GPR700:GPR_700_mu3"/〉 For 1 ms sampled data the ratio 〈displayedItem type="mathematics" xml:id="mu4" numbered="no"〉〈mediaResource alt="image" href="urn:x-wiley:00168025:GPR700:GPR_700_mu4"/〉 varied between 4.5 and 5.5 dB depending on gun model. Pulse width of the 2000 psi signatures indicated they are compatible with 2 ms sample-rate recording while pulse width of the 6000 psi signatures was greater, indicating they are less compatible with 2 ms sample-rate recording.Conclusions reached were that 2000 psi air guns are more efficient than higher pressure guns and are more compatible with 2 ms sample-rate requirements.

Notes: Numerous electrodes, already used in geophysics or just perfected by us, have been compared by measuring the three main characteristics which interest the user: noise spectrum, temperature coefficient and polarization with its stability versus time.Among the most used unpolarizable electrodes, silver-silver chloride (Ag-AgCl) are the best ones. But a systematic research of all different possible metal-salt couples, have led us to use lead-lead chloride (Pb-PbCl2) for the following reasons: noise as low as the one of Ag-AgCl at 1 Hz and even lower for the low frequencies (0.4 μV at 1 Hz and 1.2 μV at 0.01 Hz for peak to peak value and ΔF=F), temperature coefficient about ten times weaker (−40 μV/°C instead of −450 μV/°C) and also better long time stability of the polarization (1 mV/month instead of 2 at 10 mV/month).We have been using these electrodes since 1977 as “tube” electrodes which are very easy to use. They allow us to record correctly the fast variations thanks to their low noise, the very slow variations, their low temperature coefficient and their stability, and this with telluric lines only about 100 m long.

Notes: The compression of seismic signals which have propagated through a dispersive medium can be achieved by a frequency-domain transformation. This transformation is formally related to the dispersion characteristic of the medium and is independent of phase and group velocities. By defining a suitable cost-function to measure the degree of dispersion of a time- signal, an iterative technique can be employed to find that transformation which gives minimum dispersion.In this paper, we assume that the inverse of the dispersion characteristic can be adequately approximated by a finite polynomial in the region of maximum signal energy density. The coefficients of this polynomial are the parameters of dispersion of the medium. These parameters can be estimated both in the presence of noise and in the case of signals made up of multiple arrivals.The techniques developed in this paper are applied to seismic signals which have been recorded underground by a set of geophones designed to detect and map discontinuities in coal-seams. Results of dispersion estimation and signal compression are discussed for data collected in the Blackshale seam, Pye Hill Colliery, near Derby, in the United Kingdom.

Notes: Sign reversals have been observed with the one-loop version of the TEM method in an area near Cloncurry, Queensland. This is the only area in which such a response has been recorded in seven years of field surveys by the Australian Bureau of Mineral Resources.The geology of the area consists mainly of pyrrhotitic graphitic shale, which has resistivities as low as 0.1 Ωm and frequency effects up to 30%. The sign reversals could be due to magnetic phenomena, reflections from layers, or complex conductivity effects.

Notes: A crucial step in the use of synthetic seismograms is the estimation of the filtering needed to convert the synthetic reflection spike sequence into a clearly recognizable approximation of a given seismic trace. In the past the filtering has been effected by a single wavelet, usually found by trial and error, and evaluated by eye. Matching can be made more precise than this by using spectral estimation procedures to determine the contribution of primaries and other reflection components to the seismic trace. The wavelet or wavelets that give the least squares best fit to the trace can be found, the errors of fit estimated, and statistics developed for testing whether a valid match can be made.If the composition of the seismogram is assumed to be known (e.g. that it consists solely of primaries and internal multiples) the frequency response of the best fit wavelet is simply the ratio of the cross spectrum between the synthetic spike sequence and the seismic trace to the power spectrum of the synthetic spike sequence, and the statistics of the match are related to the ordinary coherence function. Usually the composition cannot be assumed to be known (e.g. multiples of unknown relative amplitude may be present), and the synthetic sequence has to be split into components that contribute in different ways to the seismic trace. The matching problem is then to determine what filters should be applied to these components, regarded as inputs to a multichannel filter, in order to best fit the seismic trace, regarded as a noisy output. Partial coherence analysis is intended for just this problem. It provides fundamental statistics for the match, and it cannot be properly applied without interpreting these statistics.A useful and concise statistic is the ratio of the power in the total filtered synthetic trace to the power in the errors of fit. This measures the overall goodness-of-fit of the least squares match. It corresponds to a coherent (signal) to incoherent (noise) power ratio. Two limits can be set on it: an upper one equal to the signal-to-noise ratio estimated from the seismic data themselves, and a lower one defined from the distribution of the goodness-of-fit ratios yielded by matching with random noise of the same bandwidth and duration as the seismic trace segment. A match can be considered completely successful if its goodness-of-fit reaches the upper limit; it is rejected if the goodness-of-fit falls below the lower one.

Notes: If the conductivity of any one of the layers of a horizontally stratified earth varies exponentially with depth with or without a discontinuity at the interface, the corresponding expressions for apparent resistivity for Wenner- and Schlumberger-sounding arrays can be formulated. The general case has been broadly divided into three categories for mathematical simplicity. All previous discussions of this problem can be regarded as particular cases of the present study.

Notes: The physical properties of the serpentinized pyroxenitic and saxonitic rocks from stratiform ultramafic complexes of Roro, Singhbhum distrct, India, are examined using principal factor (R-mode) analysis technique. The variations and inter-relations of these properties reflect the compound effects of two processes—(a) degree of serpentinization, and (b) mineralogical and other changes attendant to serpentinization. Factor analysis is thus shown to be an effective tool for petrophysical inferences.

Notes: The problem of numerical evaluation of apparent resistivity curves is treated by finite difference modeling. The models proposed are set up in cylindrical coordinates and yield the potential field due to a point source located in a radially symmetric environment. The Schlumberger configuration, widely used for surface measurements, is emphasized. However, the treatment is equally applicable to other similar situations such as the computation of synthetic electric logs when the resistivity of the borehole fluid is different from that of the surrounding uniform or stratified medium. Moreover, the individual layers may not necessarily be isotropic.The medium under investigation is discretized by using a very coarse system of horizontal and vertical grid lines whose distance from the source increases logarithmically; consequently, the physical dimensions of the medium can be made “infinite” without affecting the numerical size of the model. Finer features such as a thin but anomalously resistive or conductive bed which would ordinarily be missed in coarse discretization are accurately taken into account, since the calculations are done in terms of the Dar Zarrouk parameters derived from the exact resistivity distribution of the model. This enables one to compute the potential field by inverting a small sparse matrix. When the medium comprises only a few layers, the efficiency of the finite-difference model is comparable to that of the known analytical methods; for more complicated structures, however, the finite-difference model becomes more efficient. The accuracy of finite-difference results is demonstrated by comparing them with the corresponding analytically obtained data.

Notes: A new method of estimating seismic stacking velocity from reflection seismograms is based on Fibonacci search technique and provides the highest rate of reduction of the interval of uncertainty of the stacking velocity. A review of the Fibonacci search strategy is presented, the application of the method is illustrated with synthetic and field examples.

Notes: The paper relates primarily to the borehole and the side bed correction charts for Latero-logs 3 and 7. Versions of some of these charts published by different companies—or even by the same company in different years—exhibit significant variations. Usually, such publications do not contain adequate information on how the charts were constructed and do not explain why discrepancies occur.Because of these reasons, an attempt has been made in this paper to reconstruct the borehole correction chart for Laterolog 7 and the shoulder bed correction charts for Latero-logs 3 and 7. For the latter two, the results found differ substantially from those published earlier.The paper demonstrates how departure (response) curves and correction charts for the lateral and the Laterolog 7 sondes can be computed from those for the normal sonde. An apparent resistivity formula is suggested for Laterolog 7 in which all currents that exist in the ground at the time of measurement and that produce the signal are monitored and used. Response curves and correction charts for Laterolog 7, based on such a formula, are presented as illustrations.

Notes: Over a 3-year period the productivity of perennial ryegrass (Lolium perenne L., cv. S24) swards as influenced by variations in the time of initial defoliation and close (2·5 cm) and lax (8 cm) defoliation was studied. Treatments with initial defoliations in the early vegetative stage, stem elongation and flowering stages of growth gave higher annual yields than treatments in which the initial defoliation was taken at an intermediate stage of growth when the majority of the stem apices had just been elevated above the height of defoliation. Initial defoliation treatments which removed a high proportion of apical meristems while the yield at the initial defoliation was still low produced the lowest annual yield. Consistent lax defoliation reduced yield by 14·5% compared with continual close defoliation. However, taking an initial lax defoliation followed by subsequent close defoliations produced a slight yield advantage of 4·8% over consistent close defoliation. The results are discussed in relation to other research findings and the practical implications commented upon.

Notes: Estimates of the total acidity of silage effluent from a range of first-cut silages varied from 1025 to 21,125 mg Ca CO3 per l with a weighted mean of 8817 mg l-1. Quick-lime (CaO), hydrated lime [Ca(OH)2] or caustic soda (NaOH) were found to be effective neutralizing agents when thoroughly mixed with the effluent. Results from seven field-plot experiments carried out between 1973 and 1977 involving application of silage effluent to grass swards are reported. Leaf scorch occurred when silage effluent with a total acidity equivalent to more than 6000 mg CaCO3 per l was applied at rates exceeding 50 m3 ha-1 to swards with several weeks regrowth. Scorch was most severe when applications were made during periods of dry sunny weather and to mechanically damaged swards. In these conditions reducing the total acidity to below 2000 mg CaCO3 per l by neutralization or dilution allowed rates of over 100 m3 ha-1 to be applied without harmful effects.Acid neutralization was found to be unnecessary when silage effluent was applied to recently cut swards. Here rates of up to 150 m3 ha-1 were applied without adverse effects and generally resulted in increased grass growth.

Notes: The quality of results of migration before stack is sensitive to inaccuracies in the velocity field applied. This does not hold if only traces of similar sources-receiver distances (common offset traces) enter the migration process. In this case, velocity deviations generate minor shifts in travel times of migrated interfaces but no deterioration in quality. These time shifts are proportional to both the velocity error and the square of the source-receiver distance.The above observations suggest the following migration scheme: migrate separately the traces of the various common offset planes or groups of neighbouring common offset planes; for every common midpoint plane and as a function of travel-time perform a residual NMO search to find trajectories t) =t)o+px)2 of maximum coherency along which migrated events are aligned; correct for residual NMO and stack the migration results obtained in the various common offset planes to obtain the final migration result.This process not only takes care of inaccurate migration velocities but also corrects partly for effects of refraction.It is shown by means of an example that good migration results are generated even with a considerably deviating velocity field.