7,4*5 Dr. dobson’s Obfervations on 
top; and if, in confequence of heavy rains, there was 
danger of its overflowing, a quantity of water was taken 
out; but if, in confequence of long drought, it funk 
lower, a quantity of water was then occalionally added; 
and thefe additions or fubtraftions were carefully re- 
gistered. At the end of every month, the depth of rain 
was firft calculated ; and, as each veflel received the fame 
depth of rain, I had only to examine the quantity of 
water which had been added to, or taken out of, the eva- 
porating veffel, and the evaporation of the month was 
afcertained. 
The first column of the following tables points out 
the mean temperature of the air at two in the afternoon. 
The fecond, the character of the month with refpedt to 
the winds, the number of dots exprefiing their trength ; 
and, to make this part tolerably accurate, daily obferva- 
tions on the winds were marked down, and the character 
of the month formed from a general furvey of thefe ob- 
fervations: our winds are Wefterly for near two-thirds 
of the year. The third column points out the evapora- 
tion of each month in inches and decimal parts of an 
inch. The fourth, the depth of rain during each month. 
And the fifth, the Hate of the feafons, e being prefixed 
to the evaporation of the whole three months, r to the 
I'ain, and t to the mean temperature. i 
It 
