J 



GENETIC VARIATIONS 



IN RELATION TO 



EVOLUTION 



A Critical Inquiry into the Observed 

 Types of Inherited Variation, in 

 Relation to Evolutionary Change 



BY 



H. S. JENNINGS 



•^ . - w.-. -fjj^. 



Henry IValten Professor of Z.oology ^> ,/• • 



and Director of the Zoological Laboratory >*«« I I. I ^ ^ ^ y. 



The Johns Hopkins University 1) "Sk^i r 



PUBLISHED ON THE LOUIS CLARK VANUXEM FOUNDATION 



PRINCETON 1935 

 PRINCETON UNIVERSITY PRESS 



