Mifiellanea Curtofd. % 



Pounds Troy \ this divided by 1718, the number 

 cf Inches in a Foot, will give 25*3 j- grains, or| 

 ounce 1 1\ grains for the weight of a Cube- inch 

 of Water ; wherefore the weight of % 33 grains 

 is ||| or 35- Parts of 38 of a Cube-inch cf Wa- 

 ter. Now the Area of the Circle whofe Diameter 

 is 7?<5 Inches, is 49 fcjua re Inches; by which di« 

 viding the Quantity of Water evaporated, vi%i 

 U °f an Inch, the Quote ^ or £ T fliews that 

 the thicknefs of the Water evaporated was the 

 53d part of an Inch ; but we will fuppofe it only 

 the 60th part, for the Facility of Calculation. If 

 therefore Water as warm as the Air in Summer, 

 exhales the thicknefs of a 6cth part of an Inch iri 

 two hours from its whole Surface, in 12 hours it 

 will exhale the of an Inch ; which Quantity 

 will be found abundantly fufficienc to ferve for 

 all the Rains, Springs, and Dews ; and account 

 for the Cafpian Sea, being always at a (land, 

 neither wafting nor overflowing ; as likewife for 

 the Current laid to fet always in at the Streights 

 of Gibraltar, tho' thole Mediterranean Seas re- 

 ceive fo many and fo confiderable Rivers. 



To eftimate the Quantity of Water arifing iri 

 Vapours out of the Sea, I think I ought to con- 

 fider it only for the time the Sun is up, for that 

 the Dews return in the Night, as much if not more 

 Vapours than are then emitted 5 and in Summer 

 the Days being no longer than 12 hours, this 

 Excels is ballanc^d by the weaker Aclion of the 

 Sun, efpecially when rifing before the Water be 

 warmed : So that if I allow £5 af an* Inch of the 

 Surface of the Sea, to be raifed per diem in Va- 

 poury it may not be -an improbable Conjefture, 



