Fegetahle Statich, Jf 
113 fquare inches 5 thefe 180 grains being 
equally fpread on this furface, its depth will 
be if 9 part of an inch = — .1 found 
the depth of Dew in a winter night to be the 
9^ part of an inch 3 fo that if we allow 1 5 1 
nights for the extent of thefummer's Dew, it 
will in that time arife to one inch depth. And 
reckoning the remaining 214 nights, for the 
extent of the winter's Dew, it will produce 
2. 39 inches depth, which makes the Dew 
of the whole year amount to 3.39 inches 
depth. 
And the quantity which evaporated in a 
fair fiimmer’s day from the fame furface, 
being i ounce 282 grains, gives 4^, part 
of an inch depth for evaporation, which 
is four times as much as fell at night. 
I found, by the fame means, the evapo- 
ration of a winters day to be nearly the 
fame as in a fummer's day 5 for the earth 
being in winter more faturate with moi- 
fture, that excefs of moifture anfwcrs to the 
cxcefs of heat in fummer. 
AT/V. Cruquius^ N® 381. of the Philofo- 
phical Tranfadions, found that 28 inches 
depth evaporated in a whole year from wa- 
E 4 ter, 
