178 GENETICS IN RELATION TO AGRICULTURE 
—b 
Fria. 84,—Outline diagram of a cotton leaf. The cotton-leaf factor = is 
(After Leake.) g 
ve 
Fie. 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 
Leake.) 
Digitized by Microsoft® 
