IX 



HEREDITY 



163 



form varied over double the range which could be attributed 

 to fluctuation. 



One autogenetic factor in the width of the boll is the 

 number of boll-loculi. Without attempting to correct for 

 any possible modality in the diagram we found the value 

 for correlation between these two characters in F 2 to be 

 "r" = 0'331 ( 0-061). The explanation is presumably 

 mechanical ; the bolls with more loculi have more septa, 



Charara 



King 



5 - 



A 



^ 

 Length 



FIG. 62. FORM OF THE BOLL. 



and these occupy more space, hence the boll diameter is 

 greater. 



More information on these two characters is highly 

 desirable, because of their economic importance. 



The loculi of the ovary. The inheritance of this 

 m eristic character is of peculiar interest, since it is not a 

 character of form, but of distribution, and analogous to 

 such things as the number of ray-florets in the Composite. 



A cross (Fig. 63) between an Upland with its mean at 

 4 P 3 and an Egyptian with a mean at 3'0 produced an 

 intermediate F! with the formula 4*1. In F 2 this family 



M2 



