34 



COAT CHARACTERS IN GUINEA-PIGS AND RABBITS. 



Again, black-red pigmented animals which contain recessive red 

 (or else latent red, see p. 25) when mated inter sc have produced 

 young as follows : 



We should expect the black-red young to be three times as numerous 

 as the red ones, but we find them only twice as numerous, yet the 

 numbers involved are small, and the precise proportion observed 

 probably not significant. Combining the results of all matings of 

 black pigmented animals which are expected to produce red young 

 we get a total of 105 young :* 



Black X albino. As elsewhere stated, few, if any, of my black 

 animals are entirely free from red pigmentation, and my albinos, so far 

 as determined, always possess latent red. Accordingly, more often 

 than otherwise, the young produced by this cross show more or less 

 red pigmentation, though in my experiments it has never amounted to 

 more than a few red hairs, or one or two small red spots situated at the 

 border of one of the typical pigment patches. The blackest young 

 produced in this series of experiments resulted from matings between 

 a very heavily black pigmented female (9 2012) and an albino male 

 (c? 635) part of whose gametes, as stated on page 24, entirely lacked 

 the black character. 



* Further experiments made since the foregoing was written continue to give 

 a steady excess of red animals and a corresponding deficiency of black ones. 



