SEED COAT COLOR IN GARDEN BEANS. 



83 



cate that this pigment is anthocyan. In order to distinguish this from 

 the other series it is called the red series. 



The other class of pigments encountered in this work shows itself in 

 the various shades of j'ellow, coffee brown and black seen in Giant String- 

 less, Burpee Stringless and all the Black Wax varieties. This pigment 

 does not fade in the field, and seems only slightly soluble, or possibly in- 

 soluble, in water, but dissolves in alcohol and alkalies. Not enough work 

 has been done with it to determine its identity, and this series of colors is 

 referred to in this paper as the yellow-black series. 



The variety Blue Pod Butter is, as previously explained, different from 

 most other varieties in seed coat color and in other characters as well. 

 The flower is deeper colored than any other variety and the whole plant 

 deeply tinged with purple. The seed is of ecru or buff color, not seen in 

 other self-colored varieties except Bountiful, which is similar. This buff 

 color is of the same appearance as the ground color in all mottled beans. 



In Table XI. are shown the results of crosses of Blue Pod Butter with 

 other varieties of various solid colors. In all these crosses the Fi genera- 

 tion shows no self-colored buff beans, but all are mottled. In F2 we get 

 a proportion of 1 buff or B bean to 3 of various other colors. In all cases 

 the extracted buff beans have bred true to seed color, and also they carry 

 the deeply colored flowers and purplish foliage of Blue Pod Butter. Of 

 the beans shown in the colunm headed "various other colors" in F2, 

 one-fourth are of solid color and yield only solid colored beans in F3 and 

 F4, while three-fourths are mottled and break up in F3 in the same manner 

 as do the Fi plants. In no case has a soUd colored bean jaelded a buff bean 

 like those borne by Blue Pod Butter. In Table XII. are shown crosses 



Table XII. — Crosses of Blue Pod Butter with Mottled Varieties. 



of Blue Pod Butter with mottled beans. Their behavior is similar to the 

 crosses shown in Table XI., except that homozygous mottled beans 



