Vegetable Stanch . 
depth, to repleniffi the earth with moifture 
for vegetation, and to fupply the Springs 
and Rivers. 
In the cafe of the hop-ground, the eva- 
poration from the hops may be confidered 
only for three months at tv- part of an inch 
each day, which will be tv of an inch ; 
but before we allow < 5 . 2 inches vapor to 
evaporate from the furface of the ground, 
which added to tv inch, gives 7. 1 inches, 
which is the utmofl: that can be evaporated 
from a furface of hop-ground in a year. So 
that of 22 inches depth of rain, there re- 
mains 15 inches to fupply fprings 5 which 
are more or lefs exhaufted, according to 
the drynefs or wetnefs of the year. Hence 
we find that 22 inches depth of rain in a 
year is fufficient for all the purpofes of na- 
ture, in fuch flat countries as this about 
Teddington near Hampton-Court. Bin in 
the hill countries, as in Lancajhire> there 
falls 42 inches depth of rain-water 5 from 
which deducing 7 inches for evaporation, 
there remains 3 5 inches depth of water for 
the fprings; befides great fupplies from much 
more plentiful dews, than fall in plain coun- 
tries: Which vaft ftores feem fo abundantly 
fufficient to anfwer the great quantity of 
