324 BOTANICAL GAZETTE [OCTOBER 
average is 9.94 cc. per day in December, and the maximum monthly 
average is 22.20 cc. daily in April. The actual minimum during 
the 18 months was 7.01 cc. in October, and the actual maximum 
was 29.28 cc. in March. 
The short-leaved pine station, no. 3, averaged 11.67 cc. per day 
for the same period of the same year as given for stations nos. 1 and 
2; and for an 18 months’ unbroken record, 14.22 cc. perday. The 
minimum monthly average was 8 .83 cc. per day in January, and the 
maximum monthly rate 19.7 cc. daily in April. The actual 
minimum was 5.18 cc. in January, and the actual maximum was 
25.04 cc.in May. Comparison of stations 2 and 3 thus shows the 
averages as based on the yearly rate to be very similar. If, how- 
ever, a comparison be made of their rates during the two general 
periods for deciduous trees, namely, with full foliage and without 
full foliage, or summer and winter (from June to November, and 
from November to June), the comparison shows that the June to 
November season gave a rate of 12.49 cc. daily for the oak forest, 
and of 13.8 cc. daily for the pine forest; while the winter rates 
(November to June) were, respectively, 15.69 cc. and 13.70 CC. 
This demonstrates a greater evaporation in winter in the deciduous 
forest, and the greater evaporation in summer from the pine forest. 
However, the similarity in the yearly rate, covering as it does the 
extremes of the two years, shows that the evaporation in the two 
forests was not greatly different, and this may seem related to the 
fact that at both stations there was an abundance of shrubbery of 
similar composition; if anything, that of the pine wood, being in 
two stories, was the thicker, and ay telescoping of these two 
associations was conspicuous. 
The beech forest, which had been burned and pastured, gave 
an average result of 16.63 cc. daily for the whole period of 18 
months (with one break in the record for November to December 
1912), an average of 11.21 cc. per day for the period from January ! 
to May 1, 1913, and an average of 13.4 cc. for the summer (full 
foliage) period. This last compares with the same average of the 
pine wood, showing a similarity between the pine forest and the 
pastured beech wood. June shows the minimum monthly rate 
for this forest, and March the maximum (fig. 1). 
