230 Studies in Indian Cotton 



mean leaf factor of this group. It is possible that this figure, 3"52, 

 more accurately represents the true value of the narrow lobed parent 

 than that actually obtained by experiments (313). This latter figure 

 is based on six determinations only and it is a matter for regret that 

 more determinations were not possible. Not only, as has already been 

 remarked, is type 3 difficult to handle, owing to its monopodial habit, 

 but it has been found to be in a marked degree self-sterile. In the first 

 generation only six plants were obtained by self-fertilisation, while in 

 the second, numerous attempts were all unsuccessful. While, therefore, 

 the value 313 has been adopted in these calculations it must be noted 

 that this value is extremely low for the type 3 as determined on a set 

 of pure, but unrelated, plants of this type. Acceptation of the figure 

 3'52 as more nearly representing the true parental value, while 

 accounting in full for the difference of "38 found between the value 

 of the narrow lobed parent and that of the corresponding F^ group, 

 accounts only partially for the difference of 0'3-5 between that of the 

 parental mean and of the intermediate group, and fails entirely in the 

 case of the difference of 0'31 between the broad lobed parent and its 

 corresponding F^ group. These differences must for the present remain 

 without explanation. 



The few cases in which the i^i generation has been crossed with the 

 parent types are given in Diagrams 1 and 2. In all cases the F-^ 

 intermediate, when crossed by the broad lobed parent, has given only 

 intermediate and broad lobed offspring and, when crossed by the narrow 

 lobed parent, only intermediate and narrow lobed offspring. The 

 number of intermediates is far too small for any value to be attached to 

 comparison of their relative numbers and of the mean value of leaf 

 factor. It is impossible, therefore, to draw any further conclusion than 

 that, within the limits imposed by their paucity, these figures are in 

 complete accord with the expectation based on the conclusions derived 

 from the direct series. 



3 {d). The type of branching and the length of the 

 vegetative period. 



The differences which exist in the form of the secondary branches 

 and in the length of the vegetative period between the various types 

 under consideration have been briefly noted above (p. 209). The 

 intimate connection which has been found to exist between these two 

 characters in the Indian cottons has already been pointed out by the 

 author in Part 2 of his introductory note (12). In a still earlier 



