his treatise, "Animal Species and Evolution". George G. Simpson (1965) For his treatise, "Principles of Animal Taxonomy." Donald R. Griffin (1958) P. Jackson Darlington, Jr. (1957) For his work on Zoogeography: The Geographical Distribution of Animals was the most meritorious work in zoology published during the year. Alfred S. Romer (1956) Herbert Friedmann (1955) For his book, The Honey Guides. Dr. Friedman's studies of this little-known African bird clarified several puzzling problems concerning it. Sven P. Ekman (1953) Archie Fairly Carr (1952) Libbie H. Hyman (1951) Raymond Carroll Osburn (1950) In recognition of his studies of Bryozoa, particularly for the volume on Bryozoa of the Pacific Coast of America, part 1, published by the University of Southern California. Arthur Cleveland Bent (1949) For the 17th volume in his series on the Life Histories of the North American Birds, published by the United States National Museum. Henry B. Bigelow (1948) For his contributions to marine zoology, particularly for his part as senior author in the volume Fishes of the Western North Atlantic. John T. Patterson (1947) Robert Broom (1946) For his volume, The South Africa Fossil Ape-Men, The Australopithecinae, which was published on January 31, 1946, by the Transvaal Museum in Pretoria. Sewall Wright (1945) For his fundamental work dealing with the genetics of evolutionary processes—a program based on work over a long period, including his paper "The Differential Equation of the Distribution of Gene Frequencies." George G. Simpson (1944) For his work, Tempo and Mode in Evolution, Columbia University Press, 1944. Karl S. Lashley (1943) For his work, "Studies of Cerebral Function in Learning," Journal of Comparative Neurology, 1943, volume 79. D'arcy Thompson (1942) For his work, On Growth and Form, revised and enlarged, 1942. Theodosius Dobzhansky (1941) For his work, Genetics and the Origin of Species, second edition published in 1941. William Berryman Scott (1940) For his work, The Mammalian Fauna of the White River Oligocene. Part IV. Artiodactyia. John H. Northrop (1939) For his work, Crystalline Enzymes: The Chemistry of Pepsin, Trypsin, and Bacteriophage. Malcolm Robert Irwin (1938) For his work, Immunogenetic Studies of Species Relationships in Columbidae. George Howard Parker (1937) For his work "Do Melanophore Nerves Show Antidromic Responses?" Journal of General Physiology, volume 20, July 1937. Robert Cushman Murphy (1936) Edwin H. Colbert (1935) Theophilus S. Painter (1934) Richard Swann Lull (1933) James P. Chapin (1932) For his work entitled, The Birds of the Belgian