II2 
Journal of Agricultural Research 
Voi. XXIV, No. t 
RESULTS 
The amount of transpiration for each tree during each period of the 
study from April 26 to November 14 has been tabulated, and it is found 
that the tree-to-tree relations hold very closely, from day to day, in spite 
of great variations in the environmental conditions. It is not relevant to 
present purposes to present the detailed data. In Table II the trans¬ 
piration by months is given and the tree performances are summarized. 
In correcting for the loss of water directly from the soil, the amount of 
107 gm. for the season has been arrived at by considering the daily loss 
the same as in 1920. While in 1917 the pots were more fully protected 
from the sun, yet considerably higher air temperatures were attained, so 
that this allowance seems justifi^ and can hardly be enough in error 
appreciably to affect the results. 
