COAT CHARACTERS IN GUINEA-PIGS AND RABBITS. 



except one, that with 9 1073. Another unexpected result is the pro- 

 duction of weakly pigmented animals of the red type, i. e., of yellows, 

 and of one yellowish-black (or blue) individual, where we expect only 

 red and reddish-black offspring. The first mentioned peculiarity of 

 cT nSo is possibly shared by other cross-breds between the black and 

 red types. Thus black > red 9 1156, a daughter of black cf 2053 by 

 red 9 755, gave the following result : 



Again, reddish-black 9 3 OI 7' a daughter of the similarly pigmented 

 9 1 179 by red J 1 2054, g ave by red c? 2004, three young, all red. The 

 results thus far obtained by mating with red females the agouti d" 1178 

 (produced by the cross of black with red) have been previously given. 

 Thev indicate that this hybrid forms red and black gametes in num- 

 bers approximately equal. Combining the results of all the matings 

 made between an animal whose parents were red and black respec- 

 tively, and red animals, we get 37 red (or yellow) to 14 black, blue, or 

 agouti, where we should expect an equal number in each of the two 

 general classes. Further^ experiments are needed to show whether 

 the inequality thus far observed is a chance result which will disap- 

 pear with larger numbers, or whether it is significant and will remain. 



Several other black-red animals, which evidently contain recessive 

 red, have produced, when mated with red animals, 8 black-red and 13 

 red young. The matings making up this total are as follows : 



