This essay contains in abbreviated form the first of the author's three Riddell Memorial Lectures of 1946. It is published here by permission of the Vice-Chancellor of the University of Durham.
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Polanyi, M. Science and reality. Synthese 5, 137–150 (1946). https://doi.org/10.1007/BF02273742
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DOI: https://doi.org/10.1007/BF02273742