Experiments with other Mammals 109 



white ofTspring were produced ; but when one of these offspring 

 was mated with a pure black, 5 blacks and i gray were produced. 

 The albino must have carried, therefore, both gray and black. 



Unijorm versus Marked Coat. — It was found that the uniform 

 coat of the Belgians breeds true, but mated with albinos gave, 

 in two cases, somewhat different results : in one case the off- 

 spring showed no trace of markings (white) ; in the other case 



1 5 of the young were marked with more or less white on the fore- 

 feet, shoulders, breast, nose, and forehead. 



The subsequent history of these two sets of offspring was as 

 follows: (a) Three of the uniform or self-colored individuals 

 were bred together and with a pure self-colored individual, pro- 

 ducing 35 self-colored and 2 sHghtly marked individuals having 

 a few white hairs on the tip of the right paw. The third gen- 

 eration of the uniform individuals gave only uniform offspring. 

 (b) Four of the marked individuals produced 67 young, of which 



16 were uniform, 34 were slightly marked, and 17 had the maxi- 

 mum of white (Dutch markings). In the third generation 

 three of the uniform individuals produced 14 uniform and i 

 slightly marked. Also in the third generation the Dutch marked 

 produced 10 young, all Dutch; and three of the marked indi- 

 viduals produced 3 uniform, 12 marked, and 2 Dutch. Hurst 

 interprets these results to mean that one of the Angoras^ al- 

 though of pure stock, contained Dutch markings, latent, and 

 when crossed these appeared. When these gametes united 

 with the pure uniform gamete the slightly marked individuals 

 of the first generation were produced. Afterward segregation 

 of the gametes occurred, so that subsequently gametes for uni- 

 form and for Dutch markings appeared in about equal numbers 

 with the result that in the second generation there were one 

 quarter pure uniform, one half hybrid marked, and one quarter 

 pure Dutch. It is interesting to note that this analysis leads to 

 the conclusion hat " the coat-pattern characters — unhke the 

 previous characters dealt with — are neither dominant nor 

 recessive toward one another, but when crossed give intermediate 

 hybrids in the first generation. In the second and third gen- 



