76 



THE AMERICAN NATURALIST [Vol. XLVIII 



Results 



As a result of mating SI "blaze" with a female of this 

 dilute brown race, two litters, totalling eight young, were 

 "produced. All these young were self-colored without a 

 trace of white, and, as expected, all resembled the male in 

 coat color. 



The F l generation selfs were then crossed in two ways, 

 (1) inter se and (2) with animals of the dilute brown self 

 race to which their mother belonged. It is hoped that a 

 detailed account of all the matings made may be pub- 

 lished later, but for the present purposes certain of the 

 crosses under the first 1 leading will suffice. 



When F x was crossed inter se, two sorts of young were 

 produced, namely, those with white and those without. 

 While all of the latter type may be classed as self, the 

 former were of two general sorts: (1) those witli a 

 "blaze" as large or larger than that of SI, these we may 

 call "blaze" animals; and (2) those with only a few 

 white hairs on the forehead, which we may call few white- 

 haired (f.w.h.) animals. 



The exact numbers in this cross were 



When the F 2 few white-haired animals were bred to- 

 gether they produced three types of young: few ■white- 

 haired, blaze and self, as follows. 



of F 2 "blaze" animals, which should breed as recessives, 



