1766 — Thomas Robert Malthus was born. Malthus's observation that population increases faster than the food supply stimulated theories of social and biological competition. Darwin's theory of natural selection was the most prominent of these.
1855 — Ernst Ewald was born. Ewald was a sensory physiologist whose pressure-pattern theory of hearing proposed different patterns of basilar membrane response to combinations of intensity and frequency of sound.
1903 — Carl Jung, ever the symbolist, married Emma Rauschenbach on Valentine's Day.
1943 — The Langley Porter Clinic opened in San Francisco. The clinic was planned by Aaron J. Rosanoff while he was director of institutions for the State of California and is an outgrowth of his interest in preventive programs of mental health. The facility is now the Langley Porter Psychiatric Institute of the University of California, San Francisco.
1955 — Carl Jung appeared on the cover of Time magazine.
1974 — The U.S. Law Enforcement Assistance Administration announced the termination of behavior modification programs in federal prisons. On the next day, the APA called for the "evaluation of the use and misuse of behavior modification procedures in the criminal justice system." Sidney Bijou headed the APA panel.
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