SEED COAT COLOR IN GARDEN BEANS. 103 



Apparently the factor for the dark motthng is associated with one of the 

 motthng factors. Wliite beans may jdeld hght mottled beans, but none 

 have yielded dark mottled beans. 



There is evidently needed to produce a totally pigmented bean a factor 

 for total pigmentation. If it is absent when the factor for pigmentation 

 is present we have an eyed bean. Eye size is evidently governed by one 

 or more factors, but these investigations do not afford definite data regard- 

 ing their relations. 



Pigment patterns and pigment colors are controlled by distinct factors. 

 According to the hypothesis presented in this paper, any color shown in 

 a bean seed is, in most cases, dependent on tlu'ee or more factors. The 

 basic factor for pigmentation may be modified into either one of two 

 series, — one including the various yellows, browns and black; and the 

 other, different shades of red. The third factor, called a determiner, finally 

 determines what the color is to be. In some cases the determiners bring 

 about the color through causing an alkaline or acid condition. Possibly 

 in some cases the color is determined by the degree of acidity or alkalinity. 



The two modifiers discovered are apparently associated with one of 

 the mottling factors, but the determiners are free and independent, though 

 standing often in an epistatic or hypostatic relation to one another. 



Bibliography. 



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