142 
Journal of Agricultural Research 
Vol. XI, No. 4 
in variability between high and low ear strains. In the number of 
rows of kernels the standard deviation of the low-ear strain exceeds 
decidedly that of the high-ear strain in each season; but the coefficients 
of variability of the high-ear strain is sometimes greater and sometimes 
less than that of the low strain. The difference is probably not significant. 
Table V .—Type and variability of high- and low-ear strains of Indian corn 
crop of 1907 
Character and strain. 
Mean. 
Empir¬ 
ical 
mode. 
Standard devia¬ 
tion. 
Coefficient of varia¬ 
bility. 
Length of ear, in inches: 
High ears. 
7 - 459 ±°- °33 
8. 0 
I. l28zbo. 023 
15. 12±0. 32 
Low ears. 
Circumference of ear, in 
7 - 3 ° 9 ± -033 
7-5 
1. 139 ± • 02 3 
* 5 - 59 ± • 34 
inches: 
High ears. 
6.645 ± .017 
< 5.5 
. 551 ± .oil 
8. 29^ . 18 
Low ears. 
6.9991b .017 
7.0 
• 554 zb.on 
7 - 93 =b • 17 
Weight of ear, m ounces: 
High ears. 
10. 0901b . o8r 
10. 0 
2. 6o8± . 057 
2 5 * 8S=b . 59 
Low ears. 
Rows of kernels on ears: 
10. 569 ± . 079 
12. O 
2.6131b .056 
24. 72zb .57 
High ears. 
Low ears. 
20. 577 ± . 083 
20. O 
2 - 559 ± • °59 
12. 45 zb .29 
CROP OF : 
[908 
Length of ear, in inches: 
High ears. 
6. 380 ±0. 039 
6. 5 
I. 25 Izbo. 027 
19.6i±o. 45 
Low ears. 
Circumference of ear, in 
6. 700± . 035 
6 - 5 
I. 148 zb • 024 
17-13± • 38 
inches: 
High ears. 
6. 148 zb . 018 
6.25 
. 560 zb .013 
9. n± . 21 
Low ears. 
6. 540 ± . 020 
6. 5 
• 6541b .014 
10. 00± . 22 
Weight of ear, m ounces: 
High ears.. 
6. 9801b . 080 
6. 0 
2 . 358 ± .057 
33- 7 8 ± -89 
Low ears. 
Rows of kernels on ears: 
7- 795 ± .080 
9.0 
2. 477 ± -056 
31 . 7 8 ± .79 
High ears. 
18. 09 ± . 091 
18. 0 
2. 424zb . 064 
x 3-39± -37 
Low ears. 
18. 96 zb * 088 
18. 0 
2. 650^ . 062 
• 33 
crop of 1909 
Length of ear, in inches: 
High ears. 
6. i28zbo. 030 
6. 5 
1. 042 ±0. 022 
16. 76±0. 35 
Low ears. 
Circumference of ear, in 
inches: 
6. 322zb . 027 
6.5 
x. 032 ± . 022 
16. 32 ± .36 
High ears. 
Low ears. 
5. 942 zb .015 
6 . 522 ± . 021 
5-5 
6.25 
. 5 2 9 ± . on 
.693J: .015 
8. 90 ± . 18 
io. 62 zb . 23 
Weight of ear, in ounces: 
High ears. 
6. 43 2 ± -057 
7.0 
1. 952 ± .040 
30. 35± .69 
Low ears. 
Rows of kernels on ears: 
6. 234± .070 
6. 0 
2. 204zb . 050 
35. 07 zb .88 
High ears. 
17. 986± . 076 
18. 0 
2.258± .054 
I2 - 55 ± • 3 1 
Low ears. 
19. 7441b . 097 
20. 0 
2. 4 iOzb . 069 
12. 2I± .35 
