SEED COAT COLOR IN GARDEN BEANS. 



93 



Table XIX. — Crosses of Blue Pod Butter with Varieties of the Red 

 Series. 



The Interrelations of the Yellow-black and Red Series. 



All the varieties showing pigments of the red series are mottled beans 

 with the exception of Warren, and Warren has not been crossed with 

 varieties of the yellow-black series. Therefore all crosses between red 

 and yellow-black varieties shown in Table XX. are mottled in the first 

 generation. Owing to this fact the colors of both series may usually be 

 seen on examination of the Fi beans. It is possible to separate the beans 

 of the F2 generation into three classes, as shown in the table. The yellow- 

 brown beans are partly self-colored and partly mottled, showing only 

 yellow-brown or black, as the case may be. A larger number are mottled, 

 showing these colors and also light or dark red, or both. A third class 

 shows only red, and these are always mottled. No solid red bean of any 

 shade of color has ever appeared from the crosses shown in Table XX. 

 All plants listed in the yellow-black column breed true to these colors, 

 and the same is true of those belonging to the class of red beans. Those 

 in the middle column break up exactly like the Fi generation. These 

 facts are shown in the columns under F3 and F4. 



In crosses 198, 119, 191, 194, 115 and 52, buff beans appear in small 

 numbers in F3 and F4, but none have been observed in the F2 generation. 

 In the other crosses more have been observed. If the parent varieties 

 possess a determiner in common the chances of a buff bean appearing 

 would be small, and this may explain their absence. Probably if the 



