Oct. 22, 1917 Indirect Effects of Selections in Breeding Indian Corn 127 
Table III .—Type and variability of the two-ear strains of Indian corn —Continued 
lower-ear plot, crop op 1908 
Character and strain. 
Mean. 
Empir¬ 
ical 
mode. 
Standard devia¬ 
tion. 
Coefficient of varia¬ 
bility. 
Length of ear, in inches: 
Single ears. . 
7. 056 ±0. 043 
8.0 
1. 295±0.030 
18. 35±0. 44 
Upper ears. 
7. 2381b . 097 
7*5 
I. 227± . 068 
16. 95 ± .96 
Lower ears. 
6. 14 ± . 10 
6. 0 
1. i88± . 071 
19.3 ±i-a 
Circumference of ear, in 
inches: 
Single ears.. 
5* 74 i db *020 
6. 0 
. 574 =b -014 
io.oo± .25 
Upper ears. . . 
5-671 zb .051 
5 - 75 
• 575 ± .036 
10.14 ± .64 
Lower ears. 
5. 192 ± . 046 
5 - 2 $ 
. 514^ . 032 
10. 09 ± .64 
Weight of ear, in ounces: 
Single ears . 
6 . 740 ± . 078 
7.0 
2.1761b . 055 
32. 28± . 90 
Upper ears . 
6. 26 zb . 20 
5 -° 
2. 24 ± . 14 
35* 7 ±2. 5 
Lower ears . 
4.11 ± .17 
3 -o 
1. 79 dz . 12 
43*6 ± 3*4 
Rows of kernels on ear: 
Single ears .. 
17- 79 ± . i° 
18.0 
2. 55 ± . 071 
14. 32i .41 
Upper ears . 
17* 35 ± * 2 ° 
16. 0 
2.16 ± . 14 
12. 45 db .82 
Lower ears. 
16. 49 ± . 23 
16. 0 
2.20 ± . 16 
1 3*3 ±1-0 
lower-ear plot, crop op 1909 
Length of ear, in inches: 
Single ears. 
6. 834 ±0. 039 
8. 0 
1.143 ±0. 028 
16. 73zbo. 42 
Upper ears. 
7. 35o± .061 
7 * 5 
. 901 zb .043 
12. 26i . 59 
Lower ears. 
5. 701 ± . 078 
5*5 
1. I76zb . 055 
20. 6 zb 1. 0 
Circumference of ear, in 
inches: 
Single ears. 
6. 0141b . 019 
6. 0 
. 552 ± .013 
9. 18 zb . 23 
Upper ears. 
5.9321b .032 
6, 0 
. 464zb . 022 
7 - 32 ± .37 
Lower ears. 
5. 35^± .041 
5*5 
. 546 ± .029 
10.19 ± .55 
Weight of ear, in ounces: 
Single ears. 
6. 87 ± . 11 
7.0 
2. 228± . 078 
32.4 ±1.3 
Upper ears. 
6. 7631b . 14 
7.0 
1* 994 = 1 = .099 
29* 5 ±1. 5 
Lower ears. 
3* 88 ± . 15 
2.0 
1. 89 zb . 11 
48.7 ±3*2 
Rows of kernels on ear: 
Single ears. 
17.63 zb .094 
16.0 
■2. 496 dz . 066 
14. 16 zb .38 
Upper ears. 
16. 93 ± . 16 
16. 0 
2 . 28 zb . II 
13. 48± *67 
Lower ears. 
16. 60 zb .28 
16. 0 
2. 75 zb . 20 . 
16. 5 ± 1. 2 
lower-ear plot, crop op 1910 
Length of ear, in inches: 
Single ears.. 
7. 3i4±o. 051 
8.0 
1. 4i6zbo. 036 
19. 36zbo. 26 
Upper ears. 
7 * $* 7 ± • °39 
8. 0 
1. 088dz . 020 
14 48 zb .38 
Lower ears. 
6. 405 zb .045 
7.0 
1. 195 ± • ° 3 2 
18. 66 zb .51 
Circumference of ear, in 
inches: 
Single ears. 
6 . 272 zb . 022 
6. 0 
.587zb . 016 
9*3 6 ± *25 
Upper ears. 
6. 122 ± . 018 
6. 0 
.476zb . 012 
7. 78zb . 20 
Lower ears... 
5. 8i6± .019 
6. 0 
. 480 zb .013 
8. 25± .23 
Weight of ear, in ounces: 
Single ears. 
8. 359 db . 12 
5 *o 
2.853 d: .085 
34.1 ±1.1 
Upper ears. 
7. 770± . 087 
7.0 
2. I24zb - 061 
27. 32zb . 85 
Lower ears.. *. 
5* 793 ± .081 
5 *o 
i- 9 ° 3 ± • °S 7 
32.8 ±1. 1 
Rows of kernels on ear: 
Single ears. 
17. 44 ± . 11 
17. 24 zb . 10 
16. 0 
2. 644zb . 076 
2. 674zb . 071 
I 5 * i 5 ± *45 
15.51b: .42 
Upper ears. 
16. 0 
Lower ears. 
17. 07 zb . 11 
16. 0 
2. 584zb . 076 
15. i 4 zb . 45 
