PRODUCING A NEW COLOR 301 



will appear only when the factors for grayness 

 and blackness are absent. 



This rivalry of dominant color factors, with 

 subordination of one to another, even though 

 both are dominant over whiteness, has previously 

 been briefly referred to, and it has been noted 

 that, for convenience in describing the condition, 

 biologists have come to speak of a factor that 

 thus subordinates another, in the sense in which 

 gray subordinates black in the coat of the mouse, 

 as epistatic; the subordinated color factor (in 

 this case black) being said to be hypostatic. 



These terms are of obvious convenience, being 

 somewhat parallel in their application to the 

 Mendelian terms dominance and recessiveness, 

 yet being quite distinct, as we have seen, inas- 

 much as they apply to the relations of factors 

 that are both dominant, yet which refer to the 

 same quality and hence cannot both prevail. 



MIXED FACTORS IN THE POPPY 



Our studies of inheritance of color in the 

 poppies suggest that closely similar relations 

 exist among the pigments of the flowers. 



The exact relations of reds and yellows and 

 pinks and blues have not been carefully worked 

 out on a comprehensive scale, as have been the 

 pigment relations of the coats of mice and 



