20 
POMON A: Or, 
NOW, if we compare this Quantity thus obtain’d, with the other 
before obtain’d, we fhall find their Differenee to be inconfiderable : 
The Gallons before found to evaporate from one Rod in sat 514 
RAIS WHE aa ee area in eee ee eae 
The Gallons now found at = of an Inch per Diem for 15 % 523 
Days - = = : “ eS 
— ee 
The Difference is s - = ~ - - ¥ 
Therefore the Evaporation of Earth is nearly =4 of an Inch in a Day, 
as before faid. O.E. D. 
AC CORDIN G to the Experiments of the Reverend and Learned 
Mr. Hales, p. 56. it appears, “That the Quantity of Rain and Dew, 
“ which falls in.a, Year, is at a Medium 22 Inches. 
©THE Quantity of the Earths Evaporation in a Year, is, at leaft, 
“9 + 4 Inches, fince that is the Rate at which it evaporates in a Sum- 
* mer’s Day. oo % 3 agua 
© FROM which 9 + 2 Inches, are to be deducted 3.39 Inches, for 
“ circulating Dew, there remains 6.2. Which 6, 2 Inches_ deducted 
“ from the Quantity of R in which falls in a Year, there remains at 
“ Jeaft 16 Inches Depth, to replenifh the Earth with Moifture fr for 
“Vegetation, and to fupply the Springs and Rivers.” 
THIS 16 Inches Depth of Water, with which the Earth js replenifh’d, 
and Springs and Rivers {upplied;-would be all evaporated in the Space 
of 640 Days, which is but’ one Year and nine Months, three Weeks 
and three Days, were the Earth to be fo long without Rains, So eafily 
would the whole World be deftroy'd, were we not to receive thofe 
continual circulating Bleffings of Rain and Dew - The Truth of which 
appears by the following Calculation : 
| ar has already been proved, that an Inch Depth of Water is evapo- 
rated’ in’ 4O Days therefore tultiply 16, the Inches Depth of Water 
%s, Supa ‘Of ‘Springs, dc. by 40, the Number of Days that one 
eee : | —— Inch 
T 
