Relation of NonnvaUable Water to Hygroscopic Coefficient 99 
each plant greatly reduced the transpiring surface, thus per- 
mitting transpiration to continue for a long time before the death 
of the plants. 
Table 25. — Comparison of plants groom under field conditions 
in 1910 with those grown in greenhouse in 1911. 
Ten original Five plants 
plants from grown 
Cuervo, New in cylinders 
Mexico, 1910 1911 
Average height of plant, in inches 
Average weight of seed per plant, air-dry, in grams. . 
Average number of seeds per plant 
Average weight of single seed, in grams . 
Average weight of total dry matter at 110° C, in grams 
13.0 
3.91 
144 
0.027 
9.88 
32.8 
7.40 
228 
0.032 
20.89 
MEXICAN BEANS. 
Using seed from the same source as that employed in the pre- 
ceding year, on February 20 five germinated beans were planted 
in each of six cylinders. On March 1 all except the Wauneta and 
McCook cylinders had one or more plants above the surface. Mice 
ate off a number of the plants and on March 14 more seeds were 
planted in those cylinders in which plants had been destroyed 
while in each of the others the number of plants was reduced 
to the most vigorous four. Part of those from the second plant- 
ing died within the first three weeks after appearing above the 
surface, probably for the reason that the older plants with 
their more extensive root systems prevented the younger ones 
obtaining the minimum amount of water required. 
On April 15 the plants were very uneven in growth. In the 
H O cylinder there were four of the early ones ; these were all in 
bloom and were more vigorous than those in any other cylinder. 
The Wauneta cylinder had only three, all from the first planting. 
These also were all in bloom and nearly as vigorous as the pre- 
ceding. The McCook cylinder had three small plants from the 
second planting. The Holdrege cylinder carried one early plant 
in bloom and two late plants, but both the latter were dead. 
In the Hastings soil there was only one early plant in bloom 
together with two small late plants, while in the Lincoln 
cylinder there was one early plant in bloom and two small late 
plants, both the latter being dead. From this time on the differ- 
ences between the plants in the different cylinders became still 
more marked. The data from the experiment are summarized in 
Table 26 and the moisture conditions at the close of the experi- 
ment are shown iu Table 27. Figure 32 shows the distribution 
of roots Thruout the six feet. 
