PLATE 54 
Comparison of petal-spot development in Pima 4-lock selections (A and B), normal 
Pima (C), the first generation of a hybrid between Pima Egyptian and the Holdon 
variety of Upland cotton (D), and Holdon (E). A and B represent the range for the 
great majority of the Pima 4-lock flowers, from total absence (grade o) to about grade 2. 
C represents the full development in Pima (grade 8). D represents a rather weak 
development for an Egyptian-Upland first-generation hybrid (between grades 3 and 
4). E represents the total absence of the spot in Holdon Upland. 
