S. C. Harland 201 



In crosses of purple pod with non-purple pod, the jP, is purple 

 podded, though less intensely than the parent type. In F^ segregation 

 occurs into purple and non-purple as follows : 



This ratio is somewhat far removed from the simple 3 : 1 type, and 

 for this reason the F^ families have been presented separately. 

 The F,. 

 1. 7 purples segregated into purple and non-purple. 



2. 2 purples bred true (119 plants). 



3. 4 non-purples bred true (89 plants). 



The peculiar feature of these results is the ratio 3*9 : 1*0 of purple to 

 non-purple in F^, and the very similar ratio of 4*0 : 10 in heterozygous 

 F^ families. It is evident that a much larger series of numbers is 

 required before the exact mode of inheritance of purple pod is eluci- 

 dated. It may be assumed meanwhile that one main factor, P, is 

 responsible for purple pod. 



Relation between the factors B (black), E (New Era), and P (purple 

 pod). 



The interesting feature of the three factors B, E, and P, is that any 

 of them may produce anthocyanin pigmentation of the young pod, calyx, 

 and peduncle. E causes a lesser development of colour than B, and B 

 slightly less than P. 



