4 BULLETIN 1341, U. S, DEPAETMENT OF AGEICULTURE 
sentative seed ear of each of the strains except No. 6 is shown in 
Plate I. An ear of strain No. 6 and some extreme ears found among 
the other strains are shown in Plate II. Actual data showing the 
efficiency of selection are confined to the number of kernel rows on 
the ears. 
Table 1. 
-Distribution of ears of A /. iVo. 119 corn and six strains selected from 
it on the hasis of number of keimel rows 
strain or cross 
C. I. No. 119. 
Strain'No. 1. 
Strain No. 2. 
Strain No. 
Strain No. 4. 
Strain No. 5. 
Year 
Strain No. 6... 
No. 1 X No. 2.. 
No. 1 X No. 3.. 
No. 1 X No. 4.. 
No. 1 X No. 5.. 
No. 1 X No. 6.. 
No. 2 X No. 1.. 
No. 2 X No. 3,. 
No. SXNo. 1-. 
No. 3 X No. 2.. 
No. 3 X No. 4.. 
No. 3 X No. 5-. 
No. 3 X No. 6.. 
No. 4 X No. 5.. 
No. 6 X No. 1.. 
No. 6 X No. 3.. 
1923 
1916 
1917 
1918 
1919 
1920 
1921 
1922 
1923 
1916 
1917 
1918 
1919 
1920 
1921 
1922 
1923 
1916 
1917 
1918 
1919 
1920 
1921 
1922 
1923 
1916 
1917 
1918 
1919 
1920 
1921 
1922 
1923 
1916 
1917 
1918 
1919 
1920 
1921 
1922 
1923 
1920 
1921 
1922 
1923 
1923 
1923 
1923 
1923 
1923 
1923 
1923 
1923 
1923 
1923 
1923 
1923 
1923 
1923 
1923 
Number of ears per 1,000 by kernel-row classes 
I I 
8 10 12 14 16 18 20 i 22 24 26 I 28 30 i 32 
55 279 
I 
19I 96 
41 42 
3: 52 
.. 29 
4 21 
[No data.] 
..| 42163 
4, 42 245 
2 48 245 
.-208! 198 
1 33178 
..i 46211 
.J 331182 
61 241 353 
2 102 359 310 
.-• 10 78 328 
81 81 243 
.- 57i 57 
l| 17143 
3 24 173 
li 29 122 
91 25 118 
-i 
76! 15 1 
84 46 
116 481 
133 37 
176 108! 27 
200115 58; 20 
218 I20I 35 20 
200 2161155 84 
115' 42 
89: 22 
82 25 
69 39 
149i 33 
59- 13 
100 33 
92; 171 
4... 
173! 43; 7 4^ — 
255 231- 74 21: 3 
339 218 81 20 6, 
343 329114 57! 28; 
302 30lil46i 681 16! 
288 288138 
240293' 193 
281i275'l90 
26 
5147 
43 284 
.-.143 
16 189 
38 270 
7 163 
14 219 
I 
..-1108 
311216 
20156 
93 426 
132 360 
258 450 
150 332 
396 313 
462 149 
320 371 
374 291 
436 205 
419 281 
406^273 
249 370 
413 236 
421 124 
419 104 
370 200 
290 115 
3391 64 
359 95 
294! 
95! 
65' 
27! 
30: 
31 
147; 
il31 
290 
: 49 
1 143 
I 3 
[133 
197 
250 
362 
435 
424 
443 
256 179 
115! 23 
55 
140 
44 
268 2911 
154 250 
245 174! 
2761294 163 1 
250 168 104 
212!276 264; 
2541338 158| 
39 196 238 
286'342 159i 
349,265 lOOi 
317:250111 
241 115; 571 
179 28, 3| 
285 841 6i 
105 53... I 
68 16 
92! 27 
841 9 
65i 34 
Mean 
number of 
kernel 
rows 
32 16 
3 
31 3 
3,... 

16. 1±0. 04 
32, 8 
18.0± 
18. 7± 
18. 9± 
20. 1± 
20. 4± 
20. 4± 
Standard j Coefficient 
deviation; Of-- 
2. 18±0.03! 13. 5±0. 17 
2.65± .04; 
2. 55± . 041 
22. 9zb . 07 
17. 0± 
16. 4± 
16. 3± 
15. 7± 
16. 9± 
16. 2± 
16. 7± 
16. 2± 
15. 5± 
17. 9± 
18. 1± 
19.5it 
19. 4± 
19. 2± 
19. 8± 
19. 6± 
17. 2± 
14. 9± 
13.8db 
15. 2± 
14.7=b 
13. 9± 
14. 8± 
14. 4± 
15. 8± 
14. 3± 
13. 3± 
13. 3± 
14.1db 
13. 1± 
12. 6± 
13. 1± 
12. 4± 
11. 0± 
10. 9± 
10. 2± 
19. 8± 
21. 4± 
17. 2± 
17. 9± 
16. 7± 
18.8=b 
17.7db 
21. 1± 
17. 5± 
16.6=t 
16. 5± 
14. 9± 
13. 7± 
14. 5± 
13. 5± 
2.61± 
3.06± 
3.20± 
3.01± 
3.45± 
2. 56± 
2.37± 
2.25± 
2.72± 
2.34± 
1.99± 
2.20± 
2.22± 
14. 7± 
13. 6± 
13. 8± 
15. 2± . 23 
15. 7± .24 
14. 8± . 23 
15. 1± . 23 
04 15. 1± 
04 14. 5± 
03i 13. 8± 
041 17. 3± 
04 13. 8± 
12. 3± 
13. 2± 
13. 7i: 
05 2. 17dz 
05 2.44± 
05 2.44± 
06 2. 71± 
05 2.54± 
06; 2. 58± 
06' 2.74± 
10: 2. 71± 
! 
05 2.44db 
04' 1.95± 
04; 1.88± 
04 2.04± 
05i 2. lldb 
04i 1.87± 
04! 1.97± 
07i 2.04± 
05 2.28± 
04! 2.07dz 
04' 1.83± 
04i 1.73± 
05 2.34± 
04| 1.85± 
04i 1.71± 
06| 1.66± 
04] 1.74± 
041 1.68± 
04! 1.62± 
05 1.70db 
.03 14.0db 
,04| 13.6zb 
, 041 13. 5± 
.04 13. 9± 
.04| 13. 1± 
.04| 13.4d= 
.04 13.8d= 
.07 13. 8± 
14. 2± 
13. 1± 
13. 6± 
13. 4± 
14. 4± 
13. 5± 
13. 3± 
14. 2± 
14. 4± 
14. 5± 
13. 8± 
13.0db 
04; 16. 6± 
14. 1± 
13. 6± 
12. 7± 
.23 
03 14. 0± . 22 
15. 3± . 24 
03; 14. 9± . 23 
04 16. 7± . 39 
11 2.77± 
I2I 3.02± 
09! 2.46± 
11! 2.97± 
12 3.21± 
10 2.75± 
lOi 2. 55db 
lOi 
09 
2.62± 
2.43± 
2.38± 
2.40± 
2.40± 
1.80± 
1.90± 
1.79± 
0± .39 
1± .39 
3± . 39 
6± .44 
2± . 51 
6± .39 
4± .39 
4± .34 
9± .37 
3± .39 
6± .38 
1± .42 
1± .34 
1± . 34 
3± .33 
