Contemporary science
Modern physics, by R. A. Millikan.-The structure of atoms and its bearing on chemical valence, by Irving Langmuir.-Engineering before and after the war, by Sir Charles Parsons.-Methods of gas warfare, by S. J. M. Auld.-What are enzymes? by Benjamin Harrow.-Natural death and the duration of life, by Jacques Loeb.-The physiology of the aviator, by Yandell Henderson.-Twenty-five years of bacteriology: a fragment of medical research, by Simon Flexner.-Before and after Lister, by W. W. Keen.-The measurement and utilization of brain power in the Army, by R. M. Yerkes.-Conceptions and misconceptions in psychoanalysis, by Trigant Burrow.-Einstein's law of gravitation, by J. S. Ames M Gift 1989
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