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THE AMERICAN NATURALIST [Vol. LV 



disprove it. in which the influence of one I'aetoi- exaetlv e(iuals 

 and negratives that of throe other faetwrs. In tliis ease he finds 



oeeurs, but asynimetrieal and bimodal otherwise. Had the liypo- 

 thetieal factors been less carefully weighted by SImll, he would 



actual case in whi(ih a single factor of superior influence occurs 

 and yet in which there is no dominance, that of the blue Andalu- 

 sian fowl. Black mated witli splashed white i)roduces blue in P\, 

 an apparent blending. Yet falls, as every one admits, into 

 three distinct classes notwithstanding the occurrence of one or 

 more modifying or inhibiting factors affecting tlu^ result in a 



here obscure segregation, as Shidl assumes would be true in 

 hypothetical cases of blending iidieritance in whicli factors of 



studied. Now 1 slundd not class the <-ase of the Andalusian fowl 

 as lylending itdierilance. l)ut f think it may serve to show that 

 ShuU's objection is not well founded, in accordance with which 

 he assumes th;it a fartoi' (if major influence will not be readily 

 detected, even wiifn ii is oiicrating in conjunction with mim)r 



