1. The code of science: Analysis and some reflections on its future;Cournand;Studium Generale,1970
2. A Memorial Symposium: Claude Bernard and the Internal Environment. Sponsored by the Stanford University School of Medicine, Stanford, California, February 10-12 1978 The lecture which I presented on that occasion referred partly to the material included in this essay. I am grateful to Dr. Eugene D. Robin for permission to make use of this material