Relation of Xonavailable Water to Hygroscopic Coefficient 109 
graphed (fig. 35), the numbers of compound leaves were 1 and 5 
respectively and the tip of the plant in No. 4 was dead. On May 
15, when No. 4 was opened, the plant in it carried 4 leaves. 
Roots had penetrated the whole of the soil mass. For mois- 
ture determinations, only the most protected portion of the H O 
subsoil in each was used. All of the black soil and the 2 inches 
of subsoil below this, as well as the lowest 2 inches of the soil 
column and the 1 inch of the soil column next the cylinder wall, 
were removed and the remaining portion of the soil column, 
which was about 5 inches high and 4 inches in diameter, was well 
No. 4 No. 3 
Fig. 35. Mesquite plants of the same age. The two on the left had 
been watered freely while the other two had not been watered for 
92 days. Altho no free water remained in the soil of the latter two 
cylinders —even in the most protected portions— both plants were 
alive. 
mixed and moisture determinations made in triplicate. The free 
water content in this soil portion from cylinder No. 3 was — 0.8 
per cent and in that from No. 4 was —0.6 per cent. 
In figure 35 are shown the mesquite plants as they appeared 
on May 7, together with two others which had been transplanted 
at the same time as those in Nos. 3 and 4, but to large flowerpots, 
afterwards being watered daily. On May 7 each of the latter was 
about 26 inches high and bore about 30 compound leaves. 
