48 
Nebraska Experiment Station Research Bulletin 19 
grain weight, 100 and 30; shelling percentage, 100 and 92; 
amount of leaf area per unit dry matter, 100 and 90; ear length, 
100 and TO; and ear circumference, 100 and 84. 
When native Lancaster County corn was grown in Lan- 
caster, Thurston, Cherry, Lincoln, and Kimball Counties, the 
respective relative total plant weights were: 100, 81, 63, 44, 
and 26, while the respective relative grain weights were: 
100, 60, 39, 26, and 0.8. 
When native Kimball County corn was planted in Kimball, 
Lincoln, Cherry, Thurston, and Lancaster Counties, the rel- 
ative total plant weights were respectively: 100, 85, 113, 149, 
and 146. Corresponding relative grain values were: 100, 68, 
120, 138, and 131. 
In less extreme cases than the above comparisons, less 
marked growth differences usually exist, and great regularity 
and consistency did not always prevail. In the main, however, 
indications are similar. 
In Table 24 the twelve native corn types which were planted 
in five different parts of the State are assembled regionally. 
Thus, we have three groups — eastern, central, and western Ne- 
braska types, grown comparatively in Lancaster, Thurston, 
Cherry, Lincoln, and Kimball Counties. In Table 25 relative 
values are given for each group, based on the mean results 
for the corn grown in Lancaster County. 
The relative total yields of dry matter for eastern Ne- 
braska types grown in Lancaster, Thurston, Cherry, Lincoln 
and Kimball Counties were respectively: 100, 78, 67, 46, and 33. 
Corresponding relative yields of grain per plant were : 100, 61, 
50, 27 and 7. 
The relative total yields of dry matter for central Nebraska 
types grown in Lancaster, Thurston, Cherry, Lincoln, and Kim- 
ball Counties were respectively: 100, 77, 77, 55, and 42. Corres- 
ponding yields of grain were : 100, 78, 70, 47, and 32. 
The relative total yields of dry matter for western Ne- 
braska types grown in Lancaster, Thurston, Cherry, Lincoln, 
and Kimball Counties were respectively: 100, 83, 76, 54, and 52. 
Corresponding grain yields were: 100, 93, 92, 41, and 49. 
The effects of interchanging native corn types upon their 
relative development may be similarly observed for other plant 
characters by a study of the tables. 
HISTOLOGICAL LEAF CHARACTERS 
The eleven native types considered morphologically in the 
preceding discussion, were also compared as to leaf structure 
when grown in both Lancaster and Kimball Counties. These 
