Oct. 22t 1917 Indirect Effects of Selections in Breeding Indian Corn 129 
Table III .—Type and variability of the two-ear strains of Indian corn —Continued 
crop op 1914 
Character and strain. 
Mean. 
Empir¬ 
ical 
mode. 
Standard devia¬ 
tion. 
Coefficient of varia¬ 
bility. 
Length of ears, in inches: 
Single ears. 
6.855 ±0.061 
8.0 
1. 473±0.043 
21. 49zbo. 71 
Upper ears. 
7.190 zb .031 
7-5 
1. 052 ± .022 
14. 63 zb .32 
Lower ears. 
6. 340J: .031 
6-5 
1. oi5zb .022 
16. Olzb .36 
Circumference of ear, in 
inches: 
Single ears. 
5. 789± .024 
5 * 75 
*S74± *017 
9 * 9 2 ± *30 
Upper ears. 
5.6961b .014 
5 - 75 
• 456 ± .010 
8.01 zb . 17 
Lower ears. 
5 * 4 2 7 ± -014 
5 * 5 o 
• 440zb .010 
8. iizb . 18 
Weight of ear, in ounces: 
Single ears. 
7. 23 ± . 10 
7.0 
2. 246zb .070 
31.1 ±1. 0 
Upper ears. 
7. 060± . 048 
7.0 
i- 553 ± -034 
22. oo;b . 51 
Lower ears. 
5 - 37 < 5 ± -°49 
5 - 0 
i- 439 ± -035 
26. 77 zb .69 
Rows of kernels on ear: 
Single ears. 
i6.434± .097 
16.0 
2. 245 zb .069 
13. 66 ± .42 
Upper ears. 
l6. 004± . 065 
16.0 
2.I28zb . 046 
i 3 - 3 °± • 29 
Lower ears. 
l6. 140± . 066 
16.0 
2. o6ozb . 047 
12. 76zb .30 
crop op 1915 
Length of ears, in inches: 
Single ears . 
7. 220zbo. 075 
7-5 
I. 288 zb 0.053 
17.84 ±0.79 
Upper ears. 
7.107± . 024 
7-5 
. 900^ • 017 
12. 66zb . 24 
Lower ears. 
6. 7i8± . 025 
6 - 5 
• 939± *018 
13. 98zb .27 
Circumference of ears, in 
inches: 
Single ears. 
5. 7i8zb . 028 
5 - 75 
• 470zb .020 
8.22zb .35 
Upper ears. 
5 *485i -on 
5 * 5 
. 404zb . 008 
7 * 37 ± *14 
Lower ears . 
5. 295zb .011 
5-5 
. 4i4± . 008 
7-82± . 15 
Weight of ear, in ounces: 
Single ears . 
6. 86o± . 115 
8.0 
1.878zb .081 
27.4 ±1.3 
Upper ears . 
5. 981 zb .033 
6.0 
1. 228± .024 
20. 53 ± .41 
Lower ears . 
5. 243 zb .036 
5 *o 
1. 285zb .025 
24. 5i± . 50 
Rows of kernels on ear: 
Single ears. 
16. 69 ± . 13 
16.0 
2. 25odb .095 
13. 48 ± *6o 
Upper ears. 
I 5 * 99 °± -055 
16.0 
2. 086zb • 039 
13. 05zb .25 
Lower ears. 
16. 282 ± . 054 
16.0 
2. 026zb • 038 
12. 44 zb .24 
CROP OP 1916 
Length of ears, in inches: 
Single ears. 
6. 327±o. 042 
6.5 
0. 934 ±0. 030 
14. 77zbo. 49 
Upper ears. 
6. 54S± -°47 
6 * 5 
1.057^ .033 
16. i5zb . 52 
Lower ears. 
S-44i± .050 
K. < 
1. nizb .035 
20. 42 dz .67 
Circumference of ear, in 
inches: 
0 0 
Single ears. 
4* 995 i • 020 
5*o 
. 444± .014 
8. 89± .29 
Upper ears_*. 
5. ondr .016 
4-75 
. 369 zb .012 
7*35± * 2 3 
Lower ears. 
4. 6i5zb .018 
4* 75 
• 4i3± *013 
8 *95± *25 
Weight of ear, in ounces: 
Single ears. 
4. 762 zb . 087 
4.0 
1. 776± . 062 
37* 29 zb 1.46 
Upper ears. 
4* 549d: .054 
4.0 
i- 143 ± *038 
25.13 d= .87 
Lower ears. 
3*270zb .053 
4.0 
1.035 ± .037 
31-64zb 1. 25 
Rows of kernels on ear: 
Single ears. 
16. 249 zb . 090 
16. 0 
1. 849^ .063 
11. 37± .42 
Upper ears. 
16. 32 7 zb .095 
16. 0 
2. o7od= . 067 
12. 68zb .42 
Lower ears. 
16. 14 zb . 10 
16. 0 
2. 123zb • 074 
i3-i 5±*47 
