July i, 1921 
431 
Relation of Length of Kernel to Yield of Corn 
Table III—Frequency distribution of ears of various lengths in the progeny of smooth- , 
medium- , and rough-dented types of Commercial White corn, iqi 6 to 1919 
Year and type. 
Number of ears having a length (in inches) of- 
Num¬ 
ber 
Mean 
length. 
of 
2 
3 
sA 
4 
4 K 
5 
sK 
6 
6 % 
7 
7 K 
8 
S'A 
9 
9 % 
10 
11 
11K 
12 
ears. 
1916: 
Smooth. 
Inches. 
3 
5 
5 
8 
13 
19 
24 
23 
38 
39 
56 
70 
67 
62 
42 
22 
6 
2 
504 
8. 09 
8. 07 
Medium. 
10 
2 
4 
9 
14 
13 
23 
25 
3* 
41 
51 
66 
46 
34 
11 
6 
1 
459 
Rough. 
2 
5 
3 
7 
7 
11 
14 
20 
18 
27 
53 
49 
76 
80 
42 
38 
15 
1 
1 
469 
8. 02 
19x7: 
3 
9 
9 
18 
21 
16 
18 
27 
3 1 
28 
43 
61 
66 
62 
39 
19 
17 
1 
2 
49° 
8.14 
Medium. 
1 
4 
8 
15 
12 
20 
21 
23 
25 
39 
54 
67 
61 
66 
41 
34 
11 
2 
2 
506 
8.19 
8.05 
Rough. 
3 
6 
10 
14 
20 
36 
14 
28 
24 
29 
S3 
3i 
27 
53 
go 
22 
36 
43 
96 
56 
63 
58 
75 
37 
19 
13 
10 
1 
530 
1918: 
11 
14 
8 
13 
13 
12 
79 
81 
94 
57 
28 
12 
4 
j 
639 
6. 95 
3 
4 
3i 
67 
46 
53 
8 
1 
565 
6. 39 
Medium. 
5 
4 
10 
73 
29 
69 
64 
81 
99 
18 
7 
4 
2 
488 
6. 53 
1919: 
Smooth. 
5 
46 
48 
88 
6 
705 
649 
7- 77 
1 
2 
2 
10 
13 
13 
20 
23 
2 
14 
13 
72 
114 
128 
92 
60 
25 
14 
2 
7- 57 
'' j 
6 
32 
56 
67 
64 
121 
107 
109 
S 2 
23 
6 
2 
692 
7-33 
Four-yearaver- 
5 
age: 
7-74 
7- 5<» 
7. 48 
CIRCUMFERENCE OF EARS 
As may be seen in Table IV, which shows the circumferences of smooth, 
medium, and rough types, the rough ears are relatively large in 
circumference, those of the medium type are intermediate, and the smooth 
ears are small. The differences are consistent and probably significant. 
Similar differences for the progeny of these ears occur as shown in 
Table V. 
Table IV .—Frequency distribution of ears of various circumferences used for planting 
type test of Commercial White corn , igi6-iQ20 
Number of ears having a circumference (in inches) of 
Num¬ 
Aver¬ 
age 
ber 
cir- 
Year and type. 
5 
5 H 
s l A 
5 H 
sH 
sH 
5 H 
s 7 A 
6 
6M$ 
6X 
6H 
6/4 
6J^ 
6K 
6 H 
7 
7H 
7 X 
7 H 
i'A 
7^ 
of 
ears. 
cum- 
fer- 
ence. 
1916: 
Inches . 
4 
4 
9 
11 
7 
4 
1 
40 
6.84 
£%r\ in tri 
2 
4 
7 
7 
10 
8 
2 
40 
6.91 
4 
2 
8 
6 
7 
10 
3 
40 
7.16 
1917: 
Vi 
I 
I 
7 
5 
IO 
3 
6 
5 
3 
1 
r 
40 
6.28 
Til tltttl 
1 
5 
10 
10 
3 
3 
3 
1 
40 
6- 53 
Rough. 
2 
1 
3 
4 
5 
3 
7 
4 
2 
5 
2 
1 
40 
6.81 
1918: 
■a 
x 
8 
2 
4 
3 
3 
2 
26 
6. 19 
M p/ 1 111m 
j 
2 
5 
4 
5 
3 
5 
5 
1 
1 
1 
1 
33 
6. 60 
Rough. 
1 
2 
3 
1 
5 
2 
8 
1 
3 
1 
1 
28 
7. 21 
1919: 
Ctrl rvnt rl 
1 
1 
t 
A 
2 
2 
2 
1 
20 
5- 96 
oiuuuui...» * 
Medium..... 
O 
1 
*r 
j 
a 
*T 
A 
4 
2 
I 
1 
1 
20 
6. 16 
T? « nr 11 
j 
H 
3 
4 
3 
3 
3 
2 
1 
1 
20 
6- 55 
1920: 
n 
8 
T 7 
A 
2 
40 
6. 06 
4 
y 
j 
2 
A o 
7 
•t 
IO 
8 
7 
2 
j 
40 
6. si 
TJ /\| | rr rl 
/ 
4 
15 
8 
4 
I 
1 
40 
7-C5 
Five-year aver¬ 
age: 
6. 27 
6- 54 
6. 96 
