yegetahle Staticks. 
53 
Experiment XIX. 
In order to find out the quantity of 
that fell in the night, Aug, 15. I 
chofe two glazed earthen Pans, which were 
three inches deep, and 12 inches diameter in 
furface; I filled them with pretty moift earth 
taken off the furface of the earth j they in- 
creafed in weight by the night’s dew 180 
grains, anddecreafed in weight by the evapo- 
ration of the day i ounce 282 grains. 
N, B, 1 fet thefe Pans in other broader 
Pans, to prevent any moiftujre from the earth 
flicking to the bottoms of them. The moi- 
fter the earth, the more Dew there falls on 
it in a night, and more than a double quan- 
tity of Dew falls on a furface of water, than 
there does on an equal furface of moift earth. 
The evaporation of a furface of water in 9 
hours winter’s dry day is -ti of an inch. 
The evaporation of a furface of Ice, fet in 
the fliade during nine hours day, was 3-*i. 
So here are 540 grains more evaporated 
from the earth every 24 hours in fummer, 
than falls in Dew in the night s that is, in 2 1 
days near ounces, from a circular area 
E 3 of 
