$6 Vegetable Stanch. 



ter, i. e. r 2 of an inch each day, at a mean 

 ratej but the earth in a fummer's day evapo- 

 rates 4 - of an inch ; fo the evaporation of 

 a fiirfacc of water, is to the evaporation of 

 a furface of earth in fummcr, 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 lead 9 -j- I inches, fince that 

 is the rate; at which it evaporates in a dim- 

 mer's day : From which 9 -\- i inches is to 

 be deducted 3. 39 inches for circulating 

 daily Dew j there remains 6. 2 inches, which 

 <5. 2 inches deducted from the quantity of 

 Rain which falls in a year , there remains 

 at leaft 16 inches depth, to replenish the 

 earth with moifture for vegetation, and to 

 (apply the Springs and Rivers. 



In the cafe of the hop-ground, the eva- 

 poration from the hops may be coniidered 

 only for 3 months at t-J-t part of an inch 

 each day, which will be i%- of an inch j 

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

 porate from the furface of the ground, 

 which added to T V inch gives, 7. 1 inches, 

 which is the utmoft that can be evaporat- 

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



So 



