LETTER VII. 159 



thofe springs over ? And he replyed, That thofe 

 Oak Piles, would not decay under a hundred 

 years, long before which period of time, all the 

 Foundation- wall, would be grown into one con- 

 tinued Stone, juil like our Provoft's Garden- wall, 

 that adjoined to the Library, which had juft then 

 been dug up, to make room for that new Build- 

 ing : Nay I muft own, how all that part of the 

 Garden-wall, which was under Ground, was 

 turned into one fingle Stone, of at leaft twenty 

 yards in length, and was much harder to be broke, 

 than any Free-ftone ufed in the Building. I do 

 not trouble myfelf to enquire, whether this growth 

 was efFeded by Effluviae, or Heats, or Colds, or 

 Spar or Salts, CSc, Upon all the Sea-ihores I have 

 been at, I found feveral fmall Stones cemented 

 together, or grown into one large one : and I muft 

 farther obferve, that in the Kingdom of Chili^ a 

 River called Mendoca^ has a natural Bridge of 

 Rock over it, from the Vault of which hang fe- 

 veral pieces of Stone, refembling Salt, that con- 

 geal like Ificles, (as the Water drops from the 

 Rock) and are formed into feveral Shapes and 

 Colours. Befides ; we know too well, that Stones 

 grow pretty faft in the Kidney and Bladder of 

 Human Bodies, not excepting thofe of young 

 Children : They are many fmall ones, as it were, 

 cemented together in one Mafs. Befides, you 



find 



