178 



GENETICS IN RELATION TO AGRICULTURE 



a- b 

 Fio. 84. Outline diagram of a cotton leaf. The cotton-leaf factor = 



(After Leake.) 



Fio. 85. Typical cotton leaves; upper left, with leaf factor less than 2; below, with leaf 

 factor greater than 3; upper right, with intermediate leaf factor, approximately 2.5. (After 

 Ltake.) 



