434 
Journal of Agricultural Research 
Vol. XXI, No. 7 
Table IX .—Frequency distribution of ears with various numbers of rows of kernels in 
the progeny of smooth , medium , and rough types of corn, igi6-igig 
Year and type. 
Number of ears with— 
Num¬ 
ber of 
ears. 
Average 
number 
of rows. 
6 
rows. 
8 
rows. 
10 
rows. 
12 
rows. 
14 
rows. 
16 
rows. 
18 
rows. 
20 
rows. 
22 
rows. 
*4 
rows. 
26 
rows. 
1916: 
Smooth. 
Medium. 
9 
83 
152 
Rough. 
5 
66 
171 
138 
3 J 
70 
M 
3 
1 
1 
469 
1 5 - 1 
1917: 
Smooth. 
1 
7 
T ? 
Ann 
Medium. 
tR 
6 
'■of) 
Rough. 
13 
89 
165 
160 
83 
45 
530 
1918: 
Smooth. 
27 
155 
Medium. 
25 
Rough. 
81 
143 
50 
488 
14. 7 
1919: 
Smooth. 
3 
11 
27 
147 
6 
Medium. 
1 
6 
21 
98 
208 
Rough. 
4 
4 
11 
81 
206 
219 
119 
38 
8 
1 
1 
692 
15-4 
Four-year average: 
Smooth. 
Medium. 
14. 8 
Rough. 
LENGTH OF KERNELS 
The data presented in Table X show that the length of kernels of the 
ears selected for planting have averaged 0.422 inch for the smooth 
type, 0.473 for the medium, and 0.512 for the rough. Continuous 
selecting of smooth, medium, and rough ears appears not to have 
changed the relative length of the kernels during four generations, as 
shown in Table XI. In other words, there has been a marked regression 
toward the mean of the variety, which probably indicates that the 
length of the kernel is influenced more by environment than the other 
characters that have been studied. 
Table X. —Frequency distribution of ears with various lengths of kernels of Commercial 
White corn used in planting, igi6-igig 
Year and type. 
Number of kernels having a length (in inches) of— 
Num¬ 
ber 
Average 
length. 
n/32 
12/32 
13/32 
14/32 
15/32 
16/32 
17/32 
18/32 
of 
ears. 
1916: 
Smooth. 
A 
IQ 
T *T 
Inches. 
Medium. 
*7 
1 7 
I < 
16 
0 
40 
40 
o. 41 6 
.478 
Rough. 
y 
1 2 
T C 
T 2 
1917: 
Smooth. 
10 
15 
1 
IO 
r 
2 
2 
40 
40 
• S 3 2 
Medium. 
1 
x 2 
17 
TO 
3 
A 
• 4 r 3 
. 481 
•494 
• 455 
• 47 ° 
.487 
.428 
. 464 
• 517 
. A 0 "7 
Rough. 
D 
A 
IO 
1 
40 
1918: 
Smooth. 
2 
8 
8 
6 
A y 
2 
4 
3 
40 
26 
Medium. 
1 
10 
IO 
j x 
I 
3 
Rough. 
2 
A 
0 
IO 
33 
28 
1919: 
Smooth. 
2 
6 
*t 
8 
y 
A 
Medium. 
1 
2 
1 2 
20 
Rough. 
I 
12 
1 
Four-year average: 
Smooth. 
Medium. 
i 
• 4 * z 
. 3 *• 7 
Rough. 
f 
• 4/3 
• 5 12 
1 
J 
