oct. 22,1917 Indirect Effects of Selections in Breeding Indian Corn 109 
Table II.— Type and variability of the four chemical-composition strains of Indian corn 
for 11 crops , 1905 to 1915 —Continued 
crop op 1906 
Character and strain. 
Mean. 
Em¬ 
pirical 
mode. 
Standard devia¬ 
tion. 
Coefficient of vari¬ 
ability. 
Length of ear, in inches: 
High-protein. 
7.880±0. 043 
8. 0 
I. 201 ±0. 030 
15. 24 io. 39 
Low-protein. 
8. 841 ± . 050 
10. 0 
1. 364± .035 
I 5 - 43 i ■ 43 
High-oil. 
7. 606 d= • 042 
7-5 
1. oi4± . 030 
i 3 * 33 ± - 4 i 
Low-oil. 
8. 378^ .056 
8-5 
1. 5io± . 040 
18. 02 ± .49 
Circumference of ear, in 
inches: 
High-protein. 
5. 863 ± .014 
6. 0 
.393± * 010 
6. 7o± . 17 
Low-protein. 
6. 495 d= .018 
6.6 
• 47 8 ± -013 
7. 38± . 19 
High-oil. 
6. i34± . 017 
6. 0 
. 4171b . 012 
6. 8o± . 20 
Low-oil. 
6. 717^ . 018 
6.9 
• 5 I 5 =t -013 
7 - 5 2 ± .19 
Weight of ear, in ounces: 
High-protein. 
8. 289^ . 081 
8.5 
2. 061 ± .057 
24.86 ± . 72 
Low-protein. 
10. 77o± . no 
11.0 
2. 68odb . 071 
24. 88± -74 
High-oil. 
8.85o± .075 
10. 0 
1.763^ .053 
19. 92± .63 
Low-oil. 
11. 498 ± . 130 
14. 0 
3.349^ .091 
29. 13 ± .84 
Rows of kernels on ears: 
High-protein. 
13. 774± • 060 
14. 0 
1. 707 ± . 042 
12. 39± .31 
Low-protein. 
14. 597 ± *072 
14.0 
1.9221b .051 
i 3 *i 7 ± -35 
High-oil. 
14. 712 ± .073 
14.0 
1.802 ± . 052 
12.25b: .36 
Low-oil. 
13.3101b .067 
14. 0 
1. 897 ± .047 
i4-25± .38 
crop op 1907 
Length of ear, in inches: 
High-protein. 
8. 474 ±0. 027 
9.0 
1. 392 ±0.027 
16.43 ±0.33 
Low-protein. 
8. 492 ± .035 
9.0 
1. 249 ± .025 
i 4 - 7 !± • 3 1 
High-oil. 
7- 982 ± .034 
8.0 
1. 242 ± . 024 
i 5 - 56 ± • 3 1 
Low-oil.... 
8. 505 ± .036 
9.0 
1. 26i± • 025 
14- 83 ± .31 
Circumference of ear, in 
inches: 
High-protein. 
6. ioodr . 013 
6. 0 
. 447 i *009 
7 - 33 ± -14 
Low-protein. 
6. 401 ± . 014 
6. 5 
. 497 ± -ojo 
7. 76± . 16 
High-oil. 
6. 428 db * 013 
6. 2 
• 453 i .009 
7 .o$± . 14 
Low-oil...... 
6. 8oodb .015 
7.0 
. 504± . on 
7 * 41 i * 16 
Weight of ear, in ounces: 
High-protein. 
9.837± .063 
10. 0 
2.095± .045 
21. 30± .47 
Low-protein. 
10. 708 ± • 076 
12. 0 
2. 592 ± .054 
24. 2i± .53 
High-oil. 
10. 302 ± . 065 
11. 0 
2. 292 db .046 
22. 25± .47 
Low-oil. 
11. 702 ± . 075 
12. 0 
2 . 438 ± .053 
20.83 ± .44 
Rows of kernels on ears: 
• 12. 88± . 26 
High-protein. 
13.968 ± .051 
14. 0 
1. 799 ± .036 
Low-protein. 
14. 643 ± • 060 
14. 0 
2. 057 ± . 042 
14* 05 dr .29 
High-oil. 
i 5 - 57 °± *°56 
16. 0 
1. 997 dr . 040 
12.83d: .26 
Low-oil. 
12. 5231b .048 
12. 0 
1. 622 ± • 034 
12. 94± . 28 
