52 The Period from 1921 to 1940 



Annual Sigma Xi Lectures 



Each year since 1922 a lecture has been delivered at the annual meeting of 

 the Association under the joint auspices of the Association and the Society 

 of the Sigma Xi. The Association sets aside an evening for these lectures 

 which are designated as General Sessions. The Society of the Sigma Xi 

 selects the lecturer. 



Each of these lectures has been published in the issue of the Sigma Xi 

 Quarterly next following the date of its delivery. Since the lectures have 

 been delivered late in December, they have been published in the early 

 months of the following year. The following is the complete list of the lec- 

 turers and the titles of their addresses from 1922 to 1939, inclusive : 



1922. Livingston Farrand : "The Nation and Its Health." 



1923. Willis R. Whitney: "The Vacuum — There's Something in It." 



1924. Frederick F. Russell : "War on Disease, Particularly Yellow 

 Fever and Malaria." 



1925. F. D. Farrell : "A Desert Becomes a Garden." 



1926. Herbert C. Hoover : "The Nation and Science." 



1927. Clarence Cook Little : "Opportunities for Research in Mammalian 

 Genetics." 



1928. Arthur Compton : "What Is Light ?" 



1929. George Howard Parker: "Some Aspects of Human Biology." 



1930. C. E. K. Mees: "The Science of Photography." 



193 1. C. F. Hirshfeld : "Whose Fault?" 



1932. Harlow Shapley : "Fact and Fancy in Cosmogony." 



1933. Henry E. Sigerist : "The Foundation of Anatomy in the Renais- 

 sance." 



1934. Earnest A. Hooton: "Homo Sapiens, Whence and Whither." 



1935. John Bellamy Taylor: "The Human Eye and the Electric Eye." 



1936. Henry G. Knight : "Selenium." 



1937. Irving Langmuir : "The Biological Applications of Surface Chem- 

 istry." 



1938. W. F. Durand: "Modern Trends in Air Transport." 



1939. Kirtley F. Mather: "The Future of Man as an Inhabitant of the 

 Earth." 



Annual Phi Beta Kappa Lectures 



Each year since 1935, at the annual meeting of the Association, a lecture 

 has been delivered under the auspices of the United Chapters of Phi Beta 

 Kappa. The lecturers and the titles of their addresses from 1935 to 1939, 

 inclusive, are as follows : 



1935. William Allan Neilson : "The American Scholar Today." The 

 American Scholar 1936, spring. 



