5 6 Vegetable Staticks. 



inches depth, to replenish 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-^T P art °f an inc ^ 

 each day, which will be 7% of an inch ; 

 but before we allowed 5.76 inches vapour to 

 evaporate from the furface of the ground, 

 which added to T ^ inch, gives 6.66 inches 

 which is the utmoft that can be evaporated 

 from a furface of hop-ground in a year. So 

 that of 22 inches depth of rain, there re- 

 main 15.34 inches to fupply fprings; which 

 are more or lefs exhaufted, according to 

 the drinefs 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 

 ^eddington near Hampton-Court* But in 

 the hill countries, ac in Lancafoire, there 

 falls 42 inches depth of rain-water; from 

 which deducting 6.66 inches for evaporation, 

 there remains 35.34 inches depth of water 

 for the fprings j befides great fupplies from 

 much more plentiful dews, than fall in plain 

 countries: Which vaft flores feem fo abun- 

 dantly fufficient to anfvvcr the great quantity 



of 



