Transpiration as a Factor in Crop Production. 167 
due to the unusually good development of ears. Based on 
leaf -area the water requirement was not below normal. 
ERECTNESS OF LEAVES. 
Two related selections of corn differing in that the leaves of 
one of them has no ligules were secured from R. A. Emerson and 
compared as to their relative water requirements. This liguleless 
character of the leaves causes them to stand somewhat more 
erect, and it had been suggested that such a condition may re- 
duce the exposure to evaporation influences and thus reduce the 
water requirement. The results follow: 
Dry 
Water 
Description 
matter 
require- 
ment 
Grams 
Grams 
Corn with normal leaves 
327 
248 
Corn with liguleless leaves 
313 
296 
Contrary to expectations, the liguleless corn had a considerably 
higher water requirement. The test needs verification with a 
greater number of selections. It is possible that one of the 
above selections was more efficient aside from this matter of 
the position of the leaves. 
SPECIAL DROUTH-RESISTANT CORN. 
The feature of this test was a hybrid 1 by H. F. Roberts in 
which he attempted to introduce the accredited drouth resistance 
of Chinese corn and Esperanza (Mexican hairy corn) into a stand- 
ard variety of Kansas corn known as Sherrod's Dent corn. The 
Chinese and Esperanza corn have bean described by G. N. Collin^ 
and are accredited by him to have great drouth resistance. The 
seed of all but the Esperanza was secured from Mr. H. F. Roberts, 
while the Esperanza was grown from old seed obtained four years 
ago from Mr. G. N. Collins. A satisfactory growth was obtained 
from all except Esperanza. All the plants of this variety were 
badly infected with smut and failed to produce ears, and for 
this reason the results from them are not included in the tables. 
The yield and water requirement may be summarized as follows : 
1 The pedigree number given this seed by Mr. Roberts is F 3 H58 — 9 ABC 
