THE AMERICAN NATURALIST [Vol.XLIX 



Plumage Color in Rrtdalus 



is due to two positive aeries 

 inant white and oneTor bit 

 tically eguafValence in onto genes 

 and each affecting the entire pi 

 age. Both off " 

 ^kme^chran 



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£Ae Inheritance of Plumage I 



