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THE AMERICAN NATURALIST [Vol. XLIII 



In matings of blues with white feathers, whites were produced, and 

 a definite proportion of homozygous blues was to be expected. With 

 one exception, however, all the blues produced from these matings 

 showed some white feathers. 



Some of these were probably homozygous, but it could not be 

 tested without making use of a large number of such birds. The 

 order of dominance was found to be black, blue, red and white. 

 In minor characters, such as irides, color of beak and claws, the 

 author obtained the following results; white irides dominate 

 black, and there is some evidence of correlation between white 

 iris and black plumage. There was also marked correlation 

 observed between the pigment in the beak and to some extent in 

 the claws, and the plumage. In general, white-plumage birds 

 have white beaks and claws. In the case of eye-wattles, red is 

 dominant over flesh color. 



B. B. Horton. 



