ytgetahle Staticks. 6 5 
may reafonably fiippofc, from the vaftforcp 
of confined vapor in <:^olipiles, in the di- 
gcficr of bones, and the engine to raife wa- 
ter by fire. 
If plants were not in this manner fup- 
plied with moifture , it were impodible for 
them to fubfift, under the fcorching heats y 
within the tropicks, where they have no 
rain for many months together : For tho’ 
the dews are much greater there, than in 
thefe more Northern climates ; yet doubtlefs 
where the heat fo much exceeds ours, the 
whole quantity evaporated in a day there, 
does as far exceed the quantity that falls 
by night in dew, as the quantity evaporat- 
ed here in a fummer’s day, is found to ex- 
ceed the quantity of dew which fails in the 
night. But the dew, which falls in a hot 
fummer feafon, cannot poilibly be of any 
benefit to the roots of trees; becaufe it is 
remanded back from the earth, by the fol- 
lowing day’s heat, before fo fmall a quanti- 
ty of moifture can have foaked to any con- 
fiderable depth. The great benefit there- 
fore of dew, in hot weather, muft be, by 
being plentifully imbibed into vegetables^ 
thereby not only refrefhing them for the 
F prefent, 
