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Nebraska Experiment Station Research Bulletin 19 
100 and 26; shelling per cent, 100 and 63; leaf area per gram 
of dry matter, 100 and 300; ear length, 100 and 40; ear cir- 
cumference, 100 and 44; leaf thickness, 100 and 100; average 
epidermal thickness, 100 and 97 : cuticular thickness, 100 and 
103 ; number of vascular bundles per unit of cross section of leaf, 
100 and 116; average number of stomata per unit leaf area, 
100 and 107 ; average length of stomata, 100 and 97 ; average 
length of stomatal aperture, 100 and 90; average length of epi- 
dermal cell, 100 and 95; average width of epidermal cell, 100 
and 95. Altho the slightly reduced length of the stomatal 
aperture taken by itself might be interpreted as an adaptive 
reaction to retard transpiration, yet this is contradicted by an 
increase in the relative number of stomata. 
On the other hand, moving corn to more favorable con- 
ditions than its native habitat accelerated the vegetative growth 
and grain production. This stimulating growth effect extended 
to the cell unit with its accompanying histological changes which 
again can not be regarded as adaptive in nature. As a parallel 
illustration with the preceding case, native Kimball County corn 
grown at home may be compared with the same corn planted in 
the more favorable region of Lancaster County. The changes 
occurring as a result of this transfer practically reversed those 
of the preceding case in which corn was moved to less favorable 
conditions. Thus, basing results on the Kimball County crop 
as 100 per cent, the following relative values are had : Plant 
height. 100 and 129; ear height, 100 and 154; leaf area, 100 
and 140; stover weight, 100 and 161: ear weight, 100 and 135; 
grain weight, 100 and 131; total dry matter, 100 and 146; shell- 
ing per cent, 100 and 97 ; leaf area per gram of dry matter, 100 
and 96; ear length, 100 and 113: ear circumference, 100 and 107; 
leaf thickness, 100 and 109: average epidermal thickness, 100 
and 106; average cuticular thickness, 100 and 91; number of 
vascular bundles per unit cross section of leaf, 100 and 96; 
average number of stomata per unit leaf area., 100 and 90; 
average length of stomata, 100 and 111: average length of 
stomatal aperture, 100 and 122; average length of epidermal 
cell, 100 and 105; average width of epidermal cell, 100 and 103. 
The actual hereditary difference between types adapted to 
favorable and to unfavorable climatic conditions may perhaps 
be best determined by comparing both in the same environment 
under favorable conditions. Eastern and western Nebraska corn 
may be thus compared by growing at the Nebraska Experiment 
Station in Lancaster County. Under these conditions western 
Nebraska corn was much smaller in plant size, leaf area, and dry 
matter. Plants from seed of both sources were rather similar as 
to leaf thickness, epidermal and cuticular thickness, relative 
