• * 



. 













, 





1.1 



>1 1 



I I 



■ 'I 



. 





\6 " Vegetable Stanch. 



ter, i. e. A of an inch each day, at a mean 

 rate ; but the earth in a fummer's day evapo- 

 rates 4 x o of an inch 5 io the evaporation of 

 a furfacc of water, is to the evaporation of 

 a furfacc of earth in fummer, as 10:3. 



The quantity of Rain and Dew which 

 falls in a year is at a medium 22 inches: 

 The quantity of the earth's evaporation in 

 a year is at leaft 9 + £ inches, fincc that 

 is the rate; at which it evaporates in a fam. 

 mer's day : From which 9 + * inches is to 

 be deducted 3. 39 inches for circulating 

 daily Dew; there remains 6. 2 inches, which 

 6. 2 inches deducted from the quantity of 

 Rain which falls in a year , there remains 

 at lead 16 inches depth, to replcnifh the 

 earth with moifturc 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 3 months at t4t part of an inch 

 each day, which will be - r V of an inch; 

 but before we allow 6. 2 inches vapor to eva- 

 porate from the furfacc of the ground, 

 which added to /»- inch gives, 7. 1 inches, 

 which is the utmoft that can be evaporat- 

 ed from a furfacc of hop-ground in a year. 



So 



