2p M A N U ?. E S. 2i; 



What is equally oblervablc, their petri- 

 TACTivE quality is, at the Iburce, barely per- 

 ceptible, and does not acquire its full effedt 

 vintil they have run fome twenty or thirty 

 yards down the llope ; about which point 

 they lofe almoft entirely their chalybeate 

 iajie, though they flill continue to tinge the 

 channel ; the colour growing fainter as the 

 IcDf^th of channel incrcalcs *. 



Where the rill meets with no vegetable 

 matter to petrify (or rather to incrujl), it 

 fprms an incrustation at the bottom of its 

 channel, which in time being filled to the 

 top, the vaiers overflow, fpread over the 

 fiOpc, and incrufl every thing which falls in 

 their way ; until having found fome hollow 

 channel (or perhaps in a ilate of nature 

 having reached ths face of the rock), they 

 form a frefli rill ; v.hlch being annihilated in 

 the fame manner, the v/aters proceed or return 

 bacl<;; alonp- the fide of the Hope -, thus form- 

 ing, in an undillurbcd (laic, a natural cone. 



* This rpri"'^, wliich is at Icaft an obje(5l of curio- 

 ^ty, and whole uaters* may conttiiu medical virtues 

 which require to be pointed out, is lituated about 

 t;vo miles fr.jsn Sal:er^ai--int!j on the road between 

 J'iCi;;RiNC and Wiiirsy. 



Where 



