The Period from 1921 to 1940 49 



1929. Walter S. Adams (astronomy) : "The Astronomer's Measuring 

 Rod." Publications of Astronomical Society of the Pacific 41 : 195-21 1. 



1930. Douglas H. Campbell (botany) : "The Origin of Land Plants." 

 Science 72: 177-187. 



1931. T. Wayland Vaughan (geology, anthropology). 



1932. A. O. Leuschner (astronomy) : "The Astronomical Romance of 

 Pluto." Publications of the Astronomical Society of the Pacific 44. 



1933. W. F. Durand (engineering) : "The Development of Our Knowl- 

 edge of the Laws of Fluid Mechanics." Science 78: 343-351. 



1934. Joel H. Hildebrand (chemistry) : "The Liquid State." Science 

 80: 125-133. 



1935. Bailey Willis (geology) : "The Living Globe." Science 82 : 427- 



433- 



1936. Richard C. Tolman (physical chemistry) : "The Present Status 

 of Cosmology." The Scientific Monthly 43 : 491-507 ; 44 : 20-40. 



1937. Herbert M. Evans (anatomy) : "The Development of Our Knowl- 

 edge of Anterior Pituitary Functions." 



1938. J. S. Plaskett (astronomy) : "Modern Conceptions of the Stellar 

 System." Popular Astronomy 48, No. 5. 1939. 



1939. S. J. Holmes (zoology) : "Darwinian Ethics and Its Practical Ap- 

 plications." Science 90: 1 17-123. 1939. 



1940. Lewis M. Terman (psychology) : "Psychological Approaches to 

 the Biography of Genius." 



Addresses of Retiring Presidents — The Southwestern Division 



1920. Edgar L. Hewett (archaeology) : "The Southwest — Yesterday 

 and Tomorrow." Archaeol. Inst, of Am. New Ser. 2 : 1-8. 



1922. A. E. Douglass (astronomy) : "Some Aspects of the Use of the 

 Annual Rings of Trees in Climatic Study." The Scientific Monthly 15: 

 1-21. 



1923. (Record not available.) 



1924. Byron Cummings (archaeology) : "The Development of Prehis- 

 toric Pueblo Culture." 



1925. Elliott C. Prentiss: "The Specific Immunity of the Tissues and 

 Its Bearing on Treatment." Science 62 : 91-95. 



1926. T. D. A. Cockerell (zoology) : "The Duty of Biology." Science 



63: 367-37I- 



1927. A. L. Flagg (engineering) : "The Search for Metals." (No rec- 

 ord of publication.) 



1929. Forrest Shreve (botany) : "The Desert as a Dwelling Place." 



1930. Francis Ramaley (botany) : "Specialization in Science." Science 

 72 : 325-326. 



