March 23 – The governor of Oklahoma signs House Bill 197 with the Montgomery amendment outlawing the theory of evolution in public school textbooks purchased by the state, the first anti-Darwinian legislation passed in the United States.[2]
Karl von Frisch publishes『Über die 'Sprache' der Bienen. Eine tierpsychologische Untersuchung』("On the 'language' of bees: an examination of animal psychology").[3]
^O'Dell, Larry. "Anti-Evolution Movement". Encyclopedia of Oklahoma History & Culture. Oklahoma Historical Society. Archived from the original on 2010-10-18. Retrieved 2010-09-13.
^Zoologische Jahrbücher (Physiologie)40: pp. 1–186.
^Zobel, O. J. (1923). "Theory and Design of Uniform and Composite Electric Wave Filters". Bell System Technical Journal. 2: 1–46. doi:10.1002/j.1538-7305.1923.tb00001.x.
^AMNH 6515. Osborn, Henry F. (1924). "Three new Theropoda, Protoceratops zone, central Mongolia". American Museum Novitates (144): 1–12. hdl:2246/3223.
^Haines, Catharine M. C. (2001). International Women in Science: A Biographical Dictionary to 1950. Santa Barbara: ABC-CLIO. p. 12. ISBN978-1-57607-090-1.