THE GREAT RELAY RACE 471 



be considered in this connection are suggested by such terms as sex 

 hormones, sex determination, sex reversal, parthenogenesis, hermaph- 

 roditism, gynandromorphs, gonad transplantation, sterility, free- 

 martins, and identical twins. In order to go on, the interested student 

 must have recourse to books and source material devoted entirely to 

 genetics. Even with such aids much that is new and illuminating in 

 this rapidly developing science will be found wanting, 



SUGGESTED READINGS 



Castle, W. E., Genetics and Eugenics, 3rd ed., Harvard University Press, 1924. 



An authoritative summary by a pioneer in genetics. 

 Crew, F. A. E., Animal Genetics, Edinburgh, 1925. 



The way a brilliant Scotchman sees heredity. 

 Dunn, L. C, Heredity and Variation, The University Society, 1934. 



Brief and very readable. 

 Jennings, H. S., Genetics, W. W. Norton & Co., 1935. 



Particular emphasis upon the chromosomal aspect. 

 Morgan, T. H., The Theory of the Gene, Yale University Press, 1926. 



The statement of a Nobel prize winner. 

 Schwesinger, G. C, Heredity and Environment, The Macmillan Co., 1934. 



Emphasis upon the genesis of psychological characteristics. 

 Sinnott, E. W., and Dunn, L. C, Principles of Genetics, 2nd ed., McGraw-Hill 



Book Co., 1932. 



A widely used text. 

 Snyder, L. H., The Principles of Heredity, D. C. Heath & Co., 1935. 



A very excellent up-to-date book. 

 Walter, H. E., Genetics, 3rd ed.. The Macmillan Co., 1930. 



An elementary presentation. 

 Wilson, E. B., The Cell in Development and Heredity, The Macmillan Co., 



1925. 



A masterly storehouse of reliable information. 



H. W. H. — 31 



