Measurements of the paramagnetic susceptibilities of powdered crystals of several salts of the iron group elements have been made over the temperature range 80° to 300°K. The results are in good agreement with the theoretical predictions of Van Vleck and his co-workers in the cases where the theory is applicable. Several of the nickel and cobalt complex salts have susceptibilities which vary in an unusual manner with the temperature.

• Received 13 May 1935

DOI:https://doi.org/10.1103/PhysRev.48.78