CAROLINE RUMBOLD 
was not until the latter part of the month that injection and weather- 
recording apparatus were in running order. 
The daily intake of the trees was measured each morning, and usually 
the injections were made in the morning. The hourly intake was not 
measured, but experience confirmed Shevyrev's observations that the in- 
take by day was greater than by night. 
The records of series of injections in individual trees showed that the 
number of the injection did not influence the amount of solution which 
went into the tree, i.e., at the sixth injection more cubic centimeters might 
go into the tree than at the first, or the third injection in the month might 
be more successful than the first or second. As has been explained, (page 
7), care was taken that the new injection was not made directly above 
or below the old injection hole. 
The intake of the trees in the different months was computed and 
plotted on ruled paper in order that estimates of the rates could be made. 
Fig. I. Graph showing the rate of intake of trees injected with the hydrocarbon 
derivatives of the benzene series during the spring and summer months. 
In computing, the mean of the intake of all the injections of a tree during 
the month represented the monthly intake of that tree per injection. | 
Plotted curves showing the rate of intake are more varied for April, 
May, and June than were those for the summer and autumn months. 
Figures 1,2, and 3 show the mean intake a day per tree reckoned from the 
day of injection for seven days, of all the trees injected with alkali metals, 
