COLOR 65 



gous, U 2 . They would produce spotted as well as uniformly pigmented 

 young. 



An example of variety i is the "old female lop" (plate i, fig. 2). When 

 mated with an albino of black ancestry, <? 45 (plate i , fig. 3) , she produced 

 a litter of 8 black young (plate i, fig. i). This experiment shows her to 

 have been homozygous in C, i. e., to have been C 2 in character, and to 

 have lacked factor A. When mated with yellow c? 179 (plate 2, fig. 8), 

 variety 3, she produced 4 yellow and 4 sooty young, exactly the expected 

 equality of yellow and sooty. Another individual probably of this same 

 variety was 9 1472, which when mated with a sooty male, 1414, produced 

 12 young, all sooty. The male just mentioned belonged apparently to 

 variety 3, for when mated with the black 9 1230 (variety 7) he produced 

 5 black, 6 sooty, and i blue young (expected 3:4:1; or if pale sooties 

 were differentiated from sooties, which we probably failed to do in making 

 the records, 3 black : 3 sooty : i blue : i pale sooty). 



Variety 2 is represented in our c?4O2 and 99632 and 647. When 

 $ 402 was mated with 9 632, they produced a litter of 4 sooty and i white 

 young (expected 3:1). Female 647, when mated with "Cutler's yellow" 

 (variety 4), produced 5 yellow, 4 sooty, and i white young (expected 

 3:3:2). The white individual produced by 9632 and c?402 was a 

 Himalayan albino. This shows one or both of the parents to have been 

 slightly different from typical variety 2, and to have carried C'. 



Variety 3 is represented probably by our 9 1471 which, when mated 

 with blue d 1 1434, produced 4 black, 2 blue, 5 sooty, and 2 pale sooty young 

 (expected 1:1:1:1). The possibility is not excluded that this female 

 was of variety 4 (capable of producing also albino young), but she cannot 

 have been of either variety i or variety 2. Another probable example of 

 variety 3 is 9 1280. (See matings of J 1228, blue, p. 63). 



Variety 4 we have not identified with certainty. Neither have we 

 made a detailed study of pale yellows, pale sooties, or spotted rabbits of 

 any color variety. We have observed, however, that dilute pigmentation, 

 as well as spotting, occurs in all the fundamental color varieties and are 

 entirely satisfied of the independent inheritance of both. 



WHITE. 



Albino rabbits differ from pigmented ones only in regard to the factor 

 C, which they either lack, or possess only in a greatly modified form, C'. 

 If C is absent, there are possible 16 different combinations of the 4 remain- 

 ing variable factors, which combinations correspond with gametes of the 

 1 6 visibly different pigmented varieties of rabbit, minus C. But if C is 

 present in the modified form, C', found in Himalayan albinos, 16 other 

 gametic combinations should be possible, only slightly different from the 

 foregoing, making in all 32 different gametic possibilities, or 232 zygotic 

 possibilities. 



