COLOR 65 



gous, U3. They would produce spotted as well as uniformly j^igmented 

 young. 



An exam|)lc' of variety i is the "old female lop" (plate i, fig. 2). When 

 mated with an albino of black ancestry, 6 45 ([)late i, fig. 3), she producccl 

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

 have been homozygous in C, /. e., to have been Cj in character, anfl to 

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

 variety 3, she jjroduced 4 yellow and 4 sooty young, exactly the exi>ect«l 

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

 variety was 9 1472, which when mated with a sooty male, 1414, produce<l 

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

 variety 3, for when mated willi the black 9 1230 (variety 7) he j)roducefl 

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

 v^Tre differentiated from sooties, which we probably failed to fio in making 

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



Variety 2 is represented in our j" 402 and 99632 and 647. When 

 c? 402 was mated with 9632, they produced a litter of 4 sooty and i white 

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

 (variety 4), produced 5 yellow, 4 sooty, and i white young (expecte<l 

 3:3:2). The white individual ]>roduced by 9632 and cf 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 9 147 1 which, when mated 

 with blue d* 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 can not 

 have been of either variety i or variety 2. Another j^robable example of 

 variety 3 is 9 1280. (See matings of d* 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 rabbit.s of 

 any color variety. We have observed, liowever, 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 i)igmented ones onl\- 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 jiossible i6 dilTerent combinations of the 4 remain- 

 ing variable factors, which combinations corresj)ond with gametes of the 

 16 visibly different i)igmented 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 ])Ossible, only slightly difierent from the 

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

 possibilities. 



