Bui. 1164. U. S. Dept. of Agriculture. 
Plate IX. 
A 
6 
Bolls of the Parental and Hybrid Cotton Plants. 
Fig. 1— The Holdon parent, showing the relatively large maximum and apical diameters 
(boll index and boll apex index high), almost complete absence of a beak, short mid- 
lock furrows, light color, and smooth surface, the oil glands being very inconspicuous. 
Fig. 2.— The first-generation hybrid, intermediate in shape, relative diameter (boll 
index i. and character of the surface, bul resembling the Pima parent in having a 
well-developed beak and no midlock furrow. Fig. 3.— The Pima parent, showing the 
relatively small maximum and apical diameters, consj i< uous beak, absence of a mid- 
lock furrow, dark color, and pitted surface. Figs, i to is. Second-generation hybrid 
individuals, showing variations as follows: I, Themosl Uplandlike; 8, themosl Pima- 
like: 4 and .">. very light and very dark colored; 5 and •;. beakless and strongly beaked: 
9 and in. very smooth and very rough surface; 11 to m. extreme variations in shape: 
17 and is. very small and very large; 7 and '.». presen< e of midlock furrow in different 
degrees: 16 and is, termination of the lock furrows at considerable distances from 
the base of the boll. 
