7^2 Of SPRINGS and Chap. 9. 



Inftrument : For there are few but what may 

 have obferv'd, that Vapours drawn out of 

 the Earth, in a Mifty Evening, have the 

 fame kind of fuperficial Effeft, (tho* perhaps, 

 not to fo great a degree) wetting not only 

 Paper, but ev'n thick Cloaths^ from whence 

 enfue very often Sicknefs, &c. 



The Obfervations there made, concerning 

 the Frigidity of the Air (on high Hills,) the 

 power and aptnefs thereof for the Condenfa- 

 tion and Converfion of thofe Vapours into 

 Water, is I believe allow'd by all Mankind ^ 

 feeing they are by their Altitude fo much 

 nearer the Atmofphere, where the general 

 Concourfe and Rendezvoufe of thofe Vapours 

 are : But it might not be amifs in this Cafe 

 to obferve, whether all Hills of one and the 

 fame Extent, afford the like quantity of 

 Springs. 1 luppofe it will be found to the 

 contrary, fince this holds good in all the 

 Vh^Tiornena's about Springs, that there are in 

 many Places large Hills and trads of Land 

 that have no Springs, though they were as 

 capacious of receiving and retaining them as 

 others 5 yet by the clofe Contexture of fome 

 forts of Ground, they never break thro', (ac- 

 cording to this Hypothefis I am advancing, 

 or otherwife) the Ground being all Gravelly, 

 they are fo difperft, as not to rife to any 

 height or ftrength, (it being obfervable that 

 Springs break out moft where the Ground is 

 of feveral different Kinds, and of different 

 perpendicular Tubes of Gravel and Clay, &c^ 



neither 



