82 Nebraska Agricultural Exp. Station , Research Bui. 20 
be taken from the butt and tip sides of the hybrid kernels used. 
This will overcome the systematic reduction in kernel size toward 
the ear tip which is associated with the natural tapering of the 
ear. 
In a test with four varieties, the average reduction in kernel 
weight from butt to tip was one per cent for each successive 
kernel. 
In an endeavor to determine the effect of foreign pollen 
Table 31. — Illustrating tl\e method of deteinnining the immedi- 
ate effect of foreign pollen upon kernel size by comparing 
the hybrid kernels with all pure kernels on an ear of com 
versus the method of comparing them in adjacent pairs. 1921. 
Ear 
No. 
Hybrid kernels mostly 
located at 
Pure a 
nd hybrid kernels compared 
only in pairs 
No. of 
kernels 
of each 
sort 
Weight of 100 
kernels 
Ratio 
of hybrid 
to 
pure 
Pure 
Hybrid 
(1) 
1 
2 
3 .... . 
4 
(2) 
Tip of ear 
Middle of ear 
Butt of ear 
Generally distributed 
(3) 
174 
72 
204 
153 
Grams 
(4) 
18.45 
26.89 
19.98 
33.25 
Grams 
(5) 
18.40 
26.94 
20.36 1 
33.63 | 
Per cent 
(6) 
99.73 
100.19 
101.90 
101.14 
Ear No. 
All hybrid kernels on ear contrastec 
pure kernels 
i with all 
No. of kernels 
of each sort 
Weight 
keri 
of 100 
nels 
Ratio 
of hybrid 
to 
pure 
Pure 
Hybrid 
Pure 
Hybrid 
(1) 
1 . 
(7) 
591 
418 
342 
548 
(8) 
276 
328 
574 
173 
Grams 
(9) 
24.72 
26.67 
19.22 
33.91 
Grams 
(10) 
18.15 
27.21 
21.51 
33.61 
Per cent 
(ID 
73.42 
102.02 
111.91 
99.12 
2 
3 
4 ::: ::::::::: . 
These ears were selected from a field of Hogue’s Yellow Dent corn partly 
fertilized with pollen from a neighboring field of Nebraska White Prize corn. 
(See fig. 21.) 
