Vegetable Statich. 57 



So that of 22 inches depth of rain, there re- 

 mains t 5 inches to fupply fprings $ 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. But in 

 the hill countries, as in Lancajhire, there falls 

 42 inches depth of rain-water ; from which 

 dedufting 7 inches for evaporation, there 

 remains 35 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 

 water, which is conveyed away, by fprings 

 and rivers, from thofe hills, that we need 

 not have recourfe, for fupplies, to the great 

 Abyfs* whofe furface, at high water, is fur- 

 mounted fome hundreds of feet by ordi- 

 nary hills, and fome thoufands of feet by 

 thofe vaft hills, from whence the longed and 

 greateft rivers take their rife, 



ExperJ 



