94 



Experimental Zoology 



which they have sprung. 1 If, for example, the characters 

 spotted and uniform coloration be considered, the number of 

 possible latent characters contained in albinos is given by 

 Cuenot in the following table : 



All these forms "prove to exist" and may lead to diverse re- 

 sults when different albinos are bred. Only by hybridizing 

 can the latent characters of the albino races be brought to light. 

 Cuenot thinks that the results of a number of authors find their 

 I correct interpretation in the latent character in the albinos 

 employed. 



In a later communication Cuenot gives the results of some 

 further experiments with gray, G ; black, B ; brown, R ; and 

 yellow, F; and with the corresponding albinos, AG, AB, AR, 

 and AY. A most remarkable result was found in the case of 

 the behavior of the yellow race. It dominates all the other 

 colors, yet when a yellow mouse is crossed, for instance, with a 

 gray, half of the offspring only are yellow, the other half being 

 gray, or black, or brown (according to the recessive colors pres- 

 ent). In Mendelian terms this means that the yellow mouse 

 never produces pure yellow gametes alone, but some yellow 

 and some of another color (gray, black, or brown). The same 

 result follows when white mice, having recessive yellow, are 

 crossed with gray, black, or brown. There result not only yel- 

 low offspring, but the other colors as well. If the yellow is a 



1 Whether an albino mutant differs in this respect from an extracted albino 

 cannot be stated. Cuenot appears to deal with both types, regardless of their 

 origin. 



