i6 
CAROLINE RUMBOLD 
canker extract. An addition of citric acid to the canker extract increased 
the intake. These extracts were injected in April and May. 
The rate of absorption of solutions of the heavy metals approximated 
that of solutions of the alkali metals. A solution so concentrated as to 
be deadly entered the trees more readily than did the more dilute solutions. 
During the treatment of the trees a daily record of the weather was 
kept by means of standard instruments. Some of the weather recording 
apparatus was not set up until the latter part of April. But after April the 
\ -^f LiOH I-200 
// ;\ , \ V 
f .\ \ \ 
/// / v. ^ 
lU \ \ ^ 
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June- 
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AOflOJT 
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3 4 
Fig. 5. Graph showing rate of intake of trees injected during the summer months 
with lithium hydroxide 1/200 G.M. 
records were kept until work stopped the last of October. A detailed ac- 
count of the evaporation and rainfall for this season is given elsewhere (30) . 
In 1913 the growing season of the chestnut began on April 28, when 
the leaf buds opened. In May the leaves were nearly mature in size, and 
flower tassels appeared. By June the leaves were full grown, the flowers 
had blossomed, and the fruit had set. In July the burs on the trees were 
half-grown, in August full-grown. In September the nuts began dropping. 
In October nuts, burs, and leaves dropped from the trees. 
Figure 7 shows a monthly compilation of the weather records and 
of the amount of solution absorbed by a tree per day during each month, 
every tree injected during the season being used in the computation. The 
figures in the monthly weather records represented the mean of the daily 
