CHARACTERS IN AN UPLAND-EGYPTIAN COTTON HYBRID. 
19 
Axis length (P) . 
Axis intemode number (Pi. 
Fruiting branch length (P . 
Fruiting branch first internode (P). 
Leaf length (H). 
Leaf width (H). 
*Petiole hairiness (P). 
Bract tooth spread (P). 
*Calyx dentation (P). 
Calyx gland abundance (P). 
Corolla length (P). 
*Corolla index P . 
Petal spot (P). 
*Anther color (P) . 
Stamen length i 1 . 
Pistil length (P). 
Boll diameter (P). 
Boll lock number (P). 
Fiber color (P). 
*Seed fuzziness (H). 
GO 
/ «? 
*? 
9- 
S G 7 <3 S 
•s^- 
-^ 
[ 
7 
1 
w 
1 
GO 
so 
to 
so 
S 6 7 <3 & 
— Ae 
/=> 
/=>• (ao w?/e//?r/0/v). 
-// 
Fig. 15.— Petiole hairiness : 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. 
Fig. 16.— Pedicel length : Frequency distribu- 
tion of Holdon x Pima Y- 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. 
For several of the size characters the position of the F 2 mode may 
be attributed to heterosis, exceptions being leaf length, leaf width, boll 
diameter, and boll lock number 
was nearer the parent 
having 
in respect to which 
the lower mean. 
the F 2 mode 
For petiole 
so 
so 
+o 
SO 
<?£> 
/O 
/ J? -? 
(f5f^ 
tl 
y 
Y* * 
/=> 
y 
^r 
//- 
go 
so 
«o 
jo 
£o 
/o 
/ 
? 
? -5 
~ t 
r 
? s> 
k. 
y 
V 
\ 
?£ 
Fig. 17.— Bract length: Frequency distribution 
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. 
Fig. 18.— Bract connation index: Frequency dis- 
tribution of Holdon X Pima F 2 cotton plants, 
by grades, as used in computing the correla- 
tions. The ordinate figures indicate the num- 
ber of plants as a percentage of the total popu- 
lation. 
hairiness and calyx dentation the F x mean was approxiniatelv 
intermediate, but for corolla index, 17 anther color, and seed fuzziness 
the mean of Fj showed a wide departure from the midpoint in 
the same direction as the mode of F 2 
the other parent would seem, therefore. 
Partial dominance of one or 
to be indicated in these cases. 
17 This was shown for corolla index not only by the doubtful Fi mean of 1920 but bv the more reliable 
Fi means of 1917 and 1918. 
