GUINEA-PIGS FROM ICA. 



25 



factor, viz, C). His gametes accordingly could transmit either C r or 

 C a , but theirs would transmit either C or C a . Accordingly their young 

 should be in the ratio 2 dark-eyed to 1 red-eyed to 1 albino. The observed 

 numbers were 13:8:4. Each of these three groups might theoretically 

 contain 8 different kinds of individuals, but certain of these would be 

 visibly indistinguishable. The classes visibly different which might 

 themselves be expected to be composite are black-eyed reds and brown- 



eyed reds, each of which might include both agouti and non-agouti 

 animals; also red-eyed whites, which might have either black or brown 

 pigment in the reddish eye, and might transmit either agouti or non- 

 agouti; and finally, the albinos, which might be of as many different 

 sorts as the colored classes, viz, 16. 



All except 2 of the 12 visibly different classes expected from this 

 mating were obtained in as small a total number of young as 25. In 

 the two missing classes, chocolate and red-eyed white, the theoretical 



