Vegetable Stanch . 
Vigour of warm and confined vapour, (fuch 
as is that which is i, 2, or 3 feet deep in 
the earth) muft be very eonfiderable, fo as 
to penetrate the roots with lome vigour; 
as we may reafonably fuppofe, from the 
vaft force of confined vapour in <^/Eolipiles y 
in the digefter of bones, and the engine to 
raife water by fire. 
If plants were not in this manner fup- 
plied with moifture, it were impoffibie for 
them to fubfift under the fcorching heats 
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 evaporate 
ed here in a hammers day, is found to ex- 
ceed the quantity of dew which falls in the 
night. But the dew, vvhicn falls in a hot 
fummer feafon, cannot poffibly be of any 
benefit to the roots of trees 5 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- 
Ifderable depth. The great benefit there- 
4 fore 
