220 



Studies in Indian Cotton 



(a) Corolla red or red on yellow. 



(b) „ red on pale yellow. 



(c) „ yellow. 



(d) „ pale yellow. 



The number of individuals occurring in each group has been found 

 as follows : 



(a) 263, (b) 88, (c) 83, (d) 17. Except for the paucity of the 

 individuals in group (d) these numbers agree fairly with the Mendelian 

 ratio of 9 : 3 : : 3 : 1. 



Further the two groups (a) and (b) are capable of subdivision in 

 accordance with the degree to which the red colouring matter suffuses 

 the leaf Owing, however, to the crosses from type 10 being discarded, 

 no full records of this appearance are available and it can only be noted 

 that, to the extent of these incomplete records, the two crosses between 

 types 3 and 9 and between types 3 and 10 are strictly comparable. 



3 (c). The leaf factor. 



The term leaf factor has been described by the author in his first 

 introductory note to the cotton work undertaken by him (11). 



Fig. 1. 



It is the numerical value obtained by dividing the difference 

 between the two measurements a and b in the accompanying diagram 



