BOM .O Now: Or; 
a ee 
Earth unfit for Vegetation ; therefore if from one Foot Square there are 
144 Cubical Inches evaporated in 40 Days, (twill require 53 Days $ to 
evaporate 194 Inches, to rendet the Earth jas dry and unfit for Vege- 
tation as aforefaid : Which 53 Days %, is about the one third Part of a 
Summer ; and ’tis always feen, that when we are without Rains for fo 
long a Space of Time, the Surface of the Earth, for a full Foot in Depth, 
is fo very dry, as to be unfit for Vegetation. 
B Y_ the preceding Calculation it has been demonftrated, That 514 
Gallons were evaporated from one Rod of Ground in 154 Days ; but 
by the Evaporation of 4 of an Inch in a Day, it appears to be fome- 
thing (tho’ very little) more. .I will demonftrate the fame in the fol- 
lowing Operation.; 
SINCE that two Square Feet’ contain» 288 Square Inches, which 
are evaporated in 40 Days, and 288 Cubical Inches being equal to one 
Gallon, ‘tis evident that one Square Foot that contains 144 Square 
Inches, being taken at one Inch in Depth, is equal to two Quarts, ‘or 
half a Gallon ; and confequently 272 Square Feet : (which is equal 
to. a Rod) docks evaporate in 40 Days, 272 times } the Quantity of 
one Foot, which is equal to 545 Quarts, equal to 136 Gallons one 
Quart; equal to three Bartels 7 and one Quart, See the Operation, § 
= ¥ % 
Ve ae 
The Cubical. Lohan in one Gallon . ne SaR coetces: Prone 
The Cubical Inches.in- two. Quarts 144» ~ equal to the Square Inches 
in a Square Foot. 
The Number of Feet i in a Soe Rod’ 172 SIE 10 1, Goes o ? 
Which multiply bys: Ihio' Se Sc eis gel conceit din, one 
“Square Foot, atione “ye in Depth; »§ —-~ 
Product sic 2iissi tse loves es HS Fhgu 
SO whigh:add~ silks wis. ayy Gate oy 1 for — —— a Foot mul- 
tiplied by 2, equal: to 2 : Foot, cgi —-——) to one —— And 
The Produé& is - - 545 Quarts, the 
Couaye eva~ 
in oi from one Rod of Ground j in the tose of 40 <a | 
* : + -¥ eo i : ‘ 
rx. , F a oa : 
nd ee es * 7 ‘ NOW 
te. 2 ed 
