PRODUCING A NEW COLOR 303 



rabbits. But the evidence seems to suggest that 

 the relations of red and yellow, for example, in 

 the case of the poppy, are somewhat comparable 

 to the relations of gray and black in the coat of 

 the mouse. 



That is to say, both of these are dominant to 

 white, but one of them is epistatic to the other. 



It is probable that red is superior in domi- 

 nance, or epistatic, to yellow, and hence that a 

 poppy will be yellow in color only when the 

 factor for red pigment is either absent or 

 masked. 



The experiments that led to the production of 

 the blue poppy suggest the possibility that blue 

 pigment may occupy some such place in the 

 scheme of coloration of the poppy as that occu- 

 pied by the chocolate color in the scheme of the 

 mouse's coat. In that case, a poppy would be 

 blue only in case the color factors for red and 

 yellow were both absent. And a poppy would 

 be white only in case the color factor for blue 

 was absent, although there might be present 

 color factors for both yellow and red in the con- 

 dition of equilibrium which we have spoken of 

 as masked. A dingy white flower might contain 

 a trace of blue. 



This supposition might explain the case of the 

 yellow poppies crossed with the white ones, in 



