348 



ROSCOE R. HYDE 



^Wooda H.d' 

 X 63.4 



.Wbodsli.^ @) 



21.2 



Diagram A Based on the foregoing data, showing different combinations and 

 the fertility in each case. 



the same grandparents, show different degrees of fertihty. The 

 inbred stock in which brothers and sisters had been continually 

 selected had lost most in fertility. In the crosses it will be 

 observed that there is no sudden rise in fertility as one might 

 expect but, on the other hand, a peculiar relation exists in that the 

 stock in each case having the highest fertility is able- on crossing 

 to bring the fertility of the lower stock up to its level and this is 

 true whether through the male or through the female. 



