Vegetable Stanch. 



57 



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

 mains 15 inches to fupply fpringsj which 

 are more or lefs cxhauftcd, according to 

 the drynefs or wetnefs of the year. Hence 

 we find that 22 inches depth of rain in a 

 year is fufficicnt 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 

 deducting 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 

 fufficicnt to anfwer the great quantity of 

 water, which is conveyed away, by fprino-s 

 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 longeft and 

 greateft rivers take their rife. 





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£XPER* 



