SUPPLEMENT II 



Nobel Prize Lecture (1934) 

 of Thomas Hunt Morgan 



Reprinted by permission of The Nobel Foundation for 

 Les Prix Nobel. The complete lecture is published in 

 The Scientific Monthly /or July igj^. Only the first 

 portion is reprinted here. 



Thomas Hunt Morgan (1866- 1945) 



By permission of The American Genetic Association, 

 The Journal of Heredity, frontispiece, Vol. 24, No. 

 416, 1933- 



SUPPLEMENT III 



Nobel Prize Lecture (1946) 

 of Hermann Joseph Muller 



Reprinted by permission of The Nobel Foundation for 

 Les Prix Nobel. Published in The Journal of Heredity, 

 38: 259-270, 1947. 



Hermann Joseph Muller (li 



