duce some other variety than yellow, even when 

 mated with yellows, we can recognize the fol- 

 lowing varieties distinct in breeding capacity, 

 though all looking very similar. 



1. Yellows which produce yellow young and gray 

 ones; 



2. Yellows which produce yellow young and black 

 ones; 



3. Yellows which produce yellow young and 

 cinnamons; 



4. Yellows which produce yellow young and brown 

 ones. 



Albino varieties occur which correspond with 

 each of these yellow varieties, viz. (1) albinos 

 which if crossed with brown will produce yel- 

 low young and gray ones; (2) albinos which 

 crossed with brown produce yellow young and 

 black ones ; (3) albinos which crossed with brown 

 produce yellow young and cinnamon ones ; and 

 (4) albinos which crossed with brown produce 

 yellow young and brown ones. Such albinos, 

 of course, differ from the corresponding yellow 

 varieties merely by the general color factor C, 

 which the albino lacks. If this is added by a 

 cross, they produce the same visible result as 



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