218 



HEREDITY AND SEX 



under the same influences. In this sense, the case is 

 like that of stock that has long been inbred, and has 



jSetf and 



in Gona. 



FIG. 105. The oblique line of letters A, 5 6 , C c , Z) d , ^ e , gives the self- 

 fertilized sets of eggs; the rest A b , A c , etc., the cross-fertilized sets. A, B, 

 C, D, E = eggs ; a, b, c, d, e, = sperm of same individuals. (From unpub- 

 lished work of W. S. Adkins.) 



come to have nearly the same hereditary complex. If 

 this similarity decreases the chances of combination be- 

 tween sperm and eggs, we can interpret the results. Cor- 

 rens' results may come under the same interpretation. 



