94 THE INHERITANCE OF COLOR IN MICE. 



Cross 170. Giving Y, BrAg, and Br. 



Cross 171. Giving Y, BrAg, and W. 



Cross 172. Giving Y, BrAg, Br, and W. 



Ydlow X brown agouti, giving intense and dilute dark-eyed young. 

 Cross 173. Giving Y, BAg, BrAg, and dBrAg. 



Cross 174. Giving Y, dY, and dBrAg. 



In the following niatings the yellow parents were dilute, and of four different sorts, riz: 



Dilute black-eyed yellow, Y 2Br2Bid2P2A2R; 

 Dilute black-eyed yellow, Y2Br2B2d2P2R; 

 Dilute brown-eyed yellow, Y2Br2d2P2A2R; 

 Dilute brown-eyed yellow, Y2Br2d2PiB. 



These four varieties are extremely difficult, if not impossible, to tell from one another by 

 superficial examination. The two brown-eyed types may, however, be distinguished at 

 times by their eye-color, which is, as in the corresponding intense types, always brown . 

 The following description will apply then to these four varieties: 



Eyes black or brown, ears pink. Ventral hairs much the same as in the intense yellow type. 

 Tail unpigmented. Dorsal hairs a dull heavy yellow with the characteristic washed-out 

 appearance of all dilute forms. Hairs at the base of the ears and around the anus are 

 indistinguishable from the rest of the coat. 



