740 



THE AMERICAN NATURALIST 



[Vol. XLV 



Wild White Cow 



Body areas 1 and 2 



Germ cells W 2 R 2 

 White Shorthorn Bull No. 6 



Body areas 1 2 



Germ cells WwR 2 w 2 r ; 



2 W 4 R, + 2 WwR, 4 WwRr 



Now mate a female of one of these types — e. g., l/WwR 2 

 2/WwRr with a white Shorthorn bull— e. g., one of type 

 No. 6. 



8 WwR 2 WwRr 

 8 W 2 R, WwRr 



White 

 White 



>. WwB a «y 2 



No theory not involving the purity — i. e., chemical iden- 

 tity, of the determiner and its segregation and recombina- 

 tion in unaltered form, together with occasional intra- 

 zygotic inhibition and reaction in response to specific con- 

 ditions, can explain the facts reported by Barrington and 

 Pearson, which facts of observation tally with those 

 reported from many other sources. 



Confirmatory of the declaration that the white of the 

 wild Park cattle is dominant white, the following evidence 

 by Storer— referring to the Chartley cattle— is offered: 



Whatever cows were put to the white balls, the calves came almost 



"The Wild White Cal 



