96 
Journal of Agricultural Research 
Vol. XXXI, No. 1 
the difference in freedom from smut in the parent-ear rows of the 
two classes in 1922 was only 16.1 per cent, whereas the. difference 
in 1923 was 33.6 per cent. 
The data on freedom from smut in the experiment with the selfed 
lines of Cuban Yellow and Boone County White varieties are given 
in Table XIII, arranged according to the number of rows of kernels 
on the parent ears. 
Table XIII. —Percentages of smut-free plants in selfed lines of Cuban Yellow and 
Boone County White from parent ears with different numbers of rows of kernels , 
at Arlington Experiment Farm } Rosslyn } Va. f 1923 
Rows from parent ears 
Variety 
12-kernel 
rows 
14-kernel 
rows 
16-kernel 
rows 
18-kernel 
rows 
20-kernel 
rows 
22-kernel 
rows 
Total 
plants 
Smut- 
free 
plants 
Total 
plants 
Smut- 
free 
plants 
Total 
plants 
Smut- 
free 
plants 
Total 
plants 
Smut- 
free 
plants 
Total 
plants 
Smut- 
free 
plants 
Total 
plants 
Smut- 
free 
plants 
Cuban Yellow. 
Total or 
average. 
Boone County 
White. 
Total or 
average- 
97 
106 
108 
92 
110 
111 
118 
111 
106 
106 
109 
P.ct. 
73.2 
78.3 
60.2 
78.3 
63.6 
59.5 
81.4 
40.5 
50.0 
54.7 
77.1 
88 
100 
107 
112 
87 
109 
108 
114 
P.ct. 
51.1 
65.0 
58.9 
58.9 
71.3 
55.0 
69.4 
52.6 
110 
106 
P.ct. 
31.8 
67.0 
119 
P.ct. 
47.9 
P.ct. 
P.ct. 
i 
i 
1,174 
a 65.0 
825 
“60.1 
216 
“49.1 
119 
“47.9 
105 
37.1 
103 
99 
111 
95 
69 
97 
105 
59 
83 
65 
90.3 
47.5 
91.9 
48.4 
73.9 
83.5 
73.3 
44.1 
67.5 
49.2 
104 
106 
89 
91 
98 
94 
99 
93 
107 
112 
31.7 
83.0 
47.2 
84.6 
69.4 
51.1 
86.9 
46.2 
89.7 
43.8 
100 
86 
82 
38.0 
69.8 
72.0 
72 
97 
72.2 
78.4 
100 
54.0 
i 
105 
“37.1 
886 
°69.0 
993 
“63.4 
268 
' 
“58.6 
169 
“75.7 
100 
“54.0 
° Computed directly from basic data. 
In the Cuban Yellow variety, the ear rows having the largest 
percentages of smut-free plants were from ears with 12 rows of' 
kernels, and the average percentage of smut-free plants decreased 
as the number of kernel rows increased. 
In Boone County White, the ear rows with the largest percentages 
of smut-free plants were from ears with 14 rows of kernels. The 
one ear with 12 rows of kernels produced plants of which only 37.1 
per cent was free from smut, and the two ears with 20 rows pro¬ 
duced plants of which 75.7 per cent was free from smut. Omitting 
these classes, there was a consistent negative relation between the 
percentages of plants free from smut and the number of rows of 
kernels on the parent ears. 
There were but few parent ears with numbers of rows other than 
those in the two principal classes in the lines of the Cuban Yellow 
