1. Historical Structure of Scientific Discovery
2. Isotopic Traces in Biology;Kamen,1957
3. I wish to record a deeply felt personal indebtedness to two former associates. Dr. Franz N. D. Kurie and Dr. Samuel Ruben. The interruption of Kurie's career by a debilitating illness a few years ago deprived nuclear physics of one of its foremost investigators. The untimely death of Ruben at the age of 29, while he was engaged in research on chemical warfare in 1943, was an unmitigated catastrophe for modern biochemistry.
4. The Disintegration of the Nuclei of Nitrogen and Other Light Atoms by Neutrons. I
5. I am happy to record my great debt to Dr. Gans and also to Dr. Henry W. Newson, my immediate predecessor in the research.