No. 631] COLOR CLASSES IN DOVES AND CAN ABIES 175 



doves, and of dark-eyed females in a cross between pink-eyed 

 male and dark-eyed female canaries may be due to a rare fac- 

 torial change from the factor w to its allelomorph W in doves 

 and from the factor p to its allelomorph P in canaries. Such a 

 change would account for the observed results, except no sterility 

 nor additional unrecorded phenotypos and would bo subject to 

 experimental tests. 



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