H. Martin Leake and B. Ram Pershad 15 



The distinction between the two forms, RB and PF, of plants which 

 bear apparently the same constitution remains unexplainable on this 

 basis for the typical GB variation of RB has been shown to occur. The 

 apparently similar diflference between PP and PPG is, however, a 

 phenomenon of a different order for, as we have shown, the latter form 

 is impure for the factor P. 



In describing the red form we noted that there appeared to exist at 

 least three distinct sub-forms which we denoted by i^i, R^, R3, and that 

 these differed in the size of the eye. These differences, again, appear 

 to be due to a factor or, more probably, a group of factors affecting the 

 size of the eye. The same feature is observable in the Group I colours. 

 In the pink forms, for instance, the colour may be so restricted that, 

 when the petal is laciniated, it is impossible to say definitely on observa- 

 tion alone whether the plant is of the P or the LP form. 



Certain other observed differences in flower colour appear to depend 

 on this group of factors. Thus the impure form PPG is associated with 

 the pure PP form, while the impure forms PP2G and PP^P are 

 associated with the pure RB. This association indicates that the differ- 

 ence between the PP and RB forms must be sought in this group of 

 factors. Again, the observed difference between the two impure forms 

 GPC and GPP appear to depend on the same gi-oup of factors, for the 

 former is associated with the Ri pure form, while the latter is associated 

 with the R2 and R3 pure forms. 



The Shape of the Petal. 



In the majority of the United Provinces' races the petal is entire. 

 In certain forms only is the margin of the petal sected, that is, divided 

 by a few cuts extending to a depth of about half an inch. This sected 

 petal is associated with the particular form of leaf found in what are 

 known as the Katela races to the extent that, while all the Katela races 

 have the sected petal, certain forms have the sected petal with the 

 common form of leaf. The character is very indefinite, the extent to 

 which secting occurs varying from a single cut on one petal to eight or 

 ten cuts on each of the four petals. The character has not formed the 

 subject of experiment. 



In many of the Malwa races the margin of the petal is deeply cut 

 and the petal is laciniated (PI. I, fig. 11). This character, in as much 

 as it divides the margin into a large number of distinct segments, in- 

 creases the difficulty in determining the marginal colour. 



