Jan. 3, 1916 
Hourly Transpiration Rate on Clear Days 
593 
mean hourly values for each environmental factor and for the transpira¬ 
tion are plotted in figure 4. The graphs for the physical factors repre¬ 
sent in each case the mean hourly values for eight clear days. The 
Fig. 4.—Composite transpiration graph for oats, with environmental graphs for corresponding period. 
transpiration measurements were made in duplicate, using two pots of 
oats of the same variety, each pot being mounted independently on an 
automatic balance. The hourly transpiration values plotted in figure 4, 
therefore, represent the mean of 16 determinations. 
