20 
BULLETIN 1164, U. S. DEPARTMENT OF AGRICULTURE. 
The range of variation of many of the characters in the second 
generation of this hybrid is shown in the illustrations as follows: 
Habit of growth and general character of the foliage, Plates XII to 
XV, which show typical plants in F, progenies^ of some of the more 
remarkable F 2 individuals. 
Leaf characters, size, shape, number of lobes, depth of lobation, 
width of the vein angle, etc., Plates XVI to XXI. 
eo 
' 2 3 *r 
r 6 r <3 S 
\ 
"TO 
SO 
20 
/O 
^l.' 
1 
f 
1 
//z 
eo 
^o 
f-O 
so 
£0 
/o 
o 
/ -? s + s- e T <9 & 
y 
# 
1 * 
-// 
Fig. 19.— Bract, number of teeth: Frequency dis- 
tribution of Hold on X Pima Fj cotton plants, by 
grades, as used in computing the correlations. 
The ordinate figures indicate the number of 
plants as a percentage of the total population. 
Fig. 20. — Bract dentation index: Frequency dis- 
tribution of Holdon X Pima Fj cotton plants, by 
grades, as used in computing the correlations. 
The ordinate figures indicate the number of 
plants as a percentage of the total population. 
length ; 
of 
Bract characters, size and shape of the bract, and number 
width, and position of the teeth, Plate V, Figures 4 to 10. 
Ceilyx characters, abundance of the oil glands and degree 
dentation, Plate VIII, Figures 4 to 7. 
Petal characters, size of the petal and degree of development of 
the spot, Plate VII. Figures 4 to 8. 
GO 
to 
•so 
i 
— ^ 
' 
A/ 
/ 
' 
"i 
/ 
r 
r 
r\ 
Fig. 21.— Bract tooth spread: Frequency distribu- 
tion of Holdon x Pima F 2 cotton plants, by 
grades, as used in computing the correlations. 
The ordinate figures indicate the number of 
plants as a percentage of the total population. 
eo 
&o 
-?o 
so 
/=> (s/o v&&/^r/o/tf) // fvo f/?/e//9T/o/sJ- 
Fig. 22.— Calyx dentation: Frequency distribu- 
tion of Holdon X Pima F 2 cotton plants, by 
grades, as used in computing the correlations. 
The ordinate figures indicate the number of 
plants as a percentage of the total population. 
TO 
Stamen characters, number of stamens, length of filaments, intensity 
of color of anthers, Plate VIII, Figures 8 to 13. 
Pistil characters, length of pistil and of stigmas, Plate VIII, Figures 
14, 15. 
Boll characters, size, shape, intensity of color, character of surface, 
degree of pointedness, presence or absence of a midlock furrow, 
Plate IX, Figures 4 to 18. 
