330 



THE AMERICAN NATURALIST [Vol. XLVI1 



No. 409? mated to 503 J 1 gave one bicolor black, 533, 

 and one tricolor black, 534. We were unable to breed the 

 bicolor reds inter se because of the lack of an adult bi- 

 color red male of this stock. 



Second Generation Crosses 



There were no matings of tricolor blacks in this gen- 

 eration. A tricolor red, black-cross, was made between 

 489? by 492 ^ (son) which gave bicolor red, 509, 510, 511. 

 No more offspring could be obtained. 



No. 423? bicolor black by tricolor black 469 $ gave 

 tricolor black, 504, 521, 522, and bicolor black. 503 and 

 520. 



Conclusions 



Tricolor blacks, inter se, gave a large number (21) of 

 their own kind, a large number (14) of bicolor blacks, 

 while 9 out of the 46 were either tricolor reds or inter- 

 mediate; there were no bicolor reds. The two remain- 

 ing individuals were classed as bicolor black, but may 

 almost as well be called tricolor. 



On the other hand, the tricolor reds mated, inter se, 

 produced in 20 individuals all four classes, viz., two tri- 

 color reds, two tricolor blacks, four intermediates, six 

 bicolor reds and six bicolor blacks. The bicolor blacks 

 bred, inter se, produced three tricolor blacks, one inter- 

 mediate, eleven bicolor blacks, one tricolor red and one 

 individual belonging to the black series, whose classifi- 

 cation as bicolor or tricolor is uncertain. Selection for 

 blacks gave more blacks, but the selection for red was 

 inconclusive. 



Spotted to Uniform Coat 



The original tricolor black female, No. 401, was mated 

 to a red male from Horton's stock and gave seven uni- 

 form reds, 425, 426, 427 (note white spot), 436, 437, 454 

 (minute spot of white on nose), 455. 



One pair of these F x reds was mated (lack of females 

 preventing mating more). From this pair we obtained 

 uniform reds, 483, 484, 495, 498, 528, 594, 595, and bi- 



