94 Experimental Zoology 
which they have sprung.’ If, for example, the characters 
spotted and uniform coloration be considered, the number of 
possible latent characters contained in albinos is given by 
Cuénot in the following table : — 
HOMOZYGOTES HETEROZYGOTES 
OR PURE RACES MOoNOHYBRIDS DIHYBRIDS 
AGU AGUABU AGUABS 
ABU AGUAYU AGUAYS 
AYU ABUAYU ABUAYS 
AGS AGSABS 
ABS AGSAYS 
AYS ABSAYVS 
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. 
Cuénot thinks that the results of a number of authors find their 
correct interpretation in the latent character in the albinos 
employed. 
In a later communication Cuénot gives the results of some 
further experiments with gray, G; black, B; brown, R; and 
yellow, Y; 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 
? Whether an albino mutant differs in this respect from an extracted albino 
cannot be stated. Cuénot appears to deal with both types, regardless of their 
origin. 
