Vol. XXI, No. 7 
436 
Journal of Agricultural Research 
The rough type failed to produce as high a percentage of ears of the 
parent type as did the others. This was especially true in the dry seasons 
of 1918 and 1919. It seems, therefore, that seasonal conditions, especially 
drought, have a decided effect on the indentation. 
Table XII .—Transmission of the character of indentation in the progeny of smooth, 
medium , and rough types of com, ig 16-1 gig 
Year and type. 
Number of ears in the progeny. 
Smooth. 
Medium. 
Rough. 
1916: 
Smooth . i. 
3 I 5 
72 
75 
Medium. 
172 
316 
190 
"Rough T , r r - r T - T - T T. 
17 
71 
83 
204 
3 6 4 
48 
Medium . 
114 
356 
226 
Rough . . 
12 
67 
246 
1918: 
Smooth. 
454 
241 
130 
Medium . 
160 
301 
325 
Rough . 
9 
2 5 
3 2 
I9i 9 : ° 
Smooth. 
5 i 5 
* 5 2 
61 
Medium. 
18O 
45 ° 
368 
Rough . 
4 
47 
263 
RATIO OF GRAIN TO COB 
The relation between smoothness of ears and the ratio of grain to cob 
are shown in Tables XIII and XIV. These data show quite conclusively 
that the percentage of grain to cob increases directly with the length of 
the kernel. For every season the smooth type had the lowest per¬ 
centage of grain to cob in the ears used for planting and in the progeny, 
while the rough type had the highest percentage. The percentage of 
grain to cob varies with the seasons. It was relatively high in the 
season of 1917 when conditions were very favorable for corn during the 
fruiting period, and it was relatively low during the hot, dry season of 
1918. 
Table XIII .—Ratio of grain to cob in smooth, medium, and rough ears used for planting 
IQ16-IQ20 
Year and type. 
Percentage 
of grain to 
cob. 
Year and type. 
Percentage 
of grain to 
cob. 
1916: 
Smooth 
77 . 0 
igig: 
Smooth. 
76.9 
79.0 
8 l. 2 
MpHiiim 
79 - 5 
80. 9 
82. 96 
83.70 
83-93 
80.8 
Medium. 
Rough . 
Rough. 
Smooth 
1920: 
Smooth. 
80. I 
Mprlium ... 
Medium. 
82. 3 
T? 011 ah 
Rough. 
84. 0 
1918: 
Smooth 
Five-year average: 
Smooth. 
79-7 
81. 2 
lVfprliiim 
81. 6 
Medium. 
Rough. 
82. 4 
Rough. 
82. 5 
