Chap, p, WATER-WORKS. 2^3 



neither according to theirs (as before hinted) 

 are they retained 5 it muft then (I think) 

 follow, that their procedure is from the fub- 

 terraneous Fountains of the Earth 3 of which 

 more in their Courfe. 



But the difficulteft Account to be given 

 about the Original of Springs (according to 

 this or any other Scheme) is, how they can 

 poffibly amount to the Tops of very high 

 Hills? Which, in my humble Opinion, is, as 

 will hereafter more plainly appear, by Ignous 

 Ebullition, or rather by that Aerial impulfe, 

 which the Philofophers call (as I fuppofe) 

 the Elaftick Power of the Air ^ of ufe in the 

 Body of the Earth, as well as in Vegetagion : 

 Tis not hard to fuppofe that they lofe their 

 Saline Qualities thro' the Veins and Faflages 

 of the Earth, by Percolation, tho' this be one 

 of the Doubts (a) Monfieur le Clerc makes 

 in that Matter. 



Mr. Ray^ in his Treat ifes of Agriculture^ 

 attributes it to the attradive Power of the 

 Sun : But this I muft confefs is not fo plain 

 to me 5 for tho 'tis natural and eafie to appre- 

 hend what Power the Sun may have in Ex- 

 halation of Fogs, Mifts and Dews, and of all 

 other Vapours of the Earth, and humid Parti- 

 cles, Herbs and Plants,(fince by placing of a wet 



W ^a in re dux occununt difficultatesy quas nm diffculter 

 folvi poffeOptnantur, i.Q^mtur qui fieri queaty up aqua Marina 

 adfummos attollatur Montes? 2, Q^i etiam fiat ut aquaFon- 

 film falfa non fit ^ Joan. Clere. Phyfica, lib. 2, feft. 21. 



U 3 Cloth, 



