12 
BULLETIN 1209, U. S. DEPARTMENT OF AGRICULTURE. 
viduals would immediately restore the heterozygous condition obtain- 
ing in the F 2 generation. 
What effect, if any, the selection practiced had on the character 
of the plants, ears, and kernels is shown in Table 2. The high yield 
of Whatley evidently was due to the large number of ears, whereas 
that of the St. Charles White-Whatley crosses was caused by a some- 
what smaller number of larger ears. The lower yields of the later 
generations of No. 201 resulted from a slight reduction in both size 
and number of ears. 
Damage by storms made it impracticable to obtain height data at 
Burdette, and the number of nodes and height of plants, as given 
in Table 2, are based on 10 plants at the Arlington Experiment 
Farm that were selected as representative. The data on height of 
plants, therefore, is of doubtful significance. The number of nodes 
is less variable, and these data probably are significant. They indi- 
cate that the number of nodes has been reduced slightly by selection. 
Data on weight of seed planted were obtained from the hand- 
pollinated ears grown at Burdette in 1920 and may be taken as rep- 
resenting a fair random sample, as only well-filled ears were used for 
each lot. There has been a slight increase in average weight of seed 
resulting from selection. 
Table 2. — Data on plants, ears, and kernels of the Whatley and St. Charles White varieties 
of corn, the crosses between these varieties, and successive generations of No. 201. 
[The results here shown were obtained in 1921 at Burdette, Ark., with the following exceptions: The 
data in column 8 are from seed from hand-pollinated ears grown in 1920, except No. 201, Fj. The data 
in columns 9 and 10 are the average for 10 representative plants grown at Arlington Experiment 
Farm, Va., in 1921.] 
Number of 
plants. 
Ears 
per 100 
bearing 
Aver- 
age 
weight 
of ears. 
Ratio 
of grain 
to ear 
corn. 
Mois- 
ture in 
shelled 
grain. 
Weight 
per 100 
seeds 
plant- 
ed. 
Average . 
Designation. 
Height 
of 
plants. 
Num- 
Total. 
Barren. 
plants. 
ber of 
nodes. 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
Whatley 
94 
92 
95 
87 
99 
99 
86 
93 
% 
95 
86 


3 
7 
4 





3 
206 
114 
161 
155 
157 
149 
140 
145 
153 
151 
153 
Pounds. 
0. 384 
. 605 
.524 
.449 
.47.) 
.495 
.456 
.4(10 
. 407 
.453 
.447 
Per 
cent. 
84.6 
85. 2 
83.6 
85.0 
84.2 
85. 8 
85.7 
84.8 
85. 2 
85.0 
85.4 
Per 
cent. 
16.8 
14.8 
16.2 
15.6 
16.0 
16.3 
16.0 
16.1 
16.5 
16.2 
16.0 
Grams. 
35.0 
37.0 
38.0 
29.0 
36.5 
35.5 
37.5 
38.5 
40.0 
39.0 
40.0 
Inches. 
128 
123 
122 
126 
129 
125 
121 
125 
122 
124 
119 
21 
St. Charles White 
17 
St. Charles White X Whatley 
No. 201, Fi (1914 seed) 
Whatley X St. Charles White 
No. 201, Fj 
19 
19 
19 
19 
No. 201, F 3 
18 
No. 201, F 4 
18 
No. 201, F 5 
18 
No. 201, F 8 
18 
No. 201, check 
17 
RESULTS OF SELECTION WTTHINI SELF-FERTILIZED LINES. 
METHOD OF SELECTION. 
Selection within self-fertilized lines was begun with No. 201 in 
1916 among the F 2 plants. The basis of selection has been the 
production of sound grain per plant, together with consideration of 
such factors as maturity, general plant proportions, and freedom 
from extreme abnormalities. Selection during the first season was 
based on the production of the individual plants, and 360 self- 
pollinated ears were obtained. Of these, 61 were selected and 
