364 



account, I learn that Dr. Vegni has applied the waters at Tivoli to 

 the same ingenious purposes. 



Pere Feuillee relates, that the petrifying waters near Guankaba- 

 lika are applied to similar purposes ; he having seen many very fine 

 statues and vases in the churches at Lima, which had been thus 

 formed in moulds, by earthy depositions. 



Some waters are so replete with earthy particles, as soon to clog 

 up the channels through which they are conveyed. A remarkable 

 instance of this kind occurred at High Littleton, in the county of 

 Somerset, about midway between Bristol and Wells. A pipe- had 

 been erected to convey away the waters, which had incommoded 

 the workmen in a coal-pit ; it was formed of elm, in shape nearly 

 a long square, being about seven inches and a half one way, and 

 four inches and a half the other. Through this, placed perpendi- 

 cularly, the water was conveyed down to the level, or passage out, 

 the trunk being about fourteen yards in length. 



This trunk, having thus been fixed up in the latter end of the 

 year 1766, was in about three years time, or rather less, found to 

 be much obstructed, and stopped up, so that, in August 1769, the 

 miners were obliged to take it up : and then, on examining it, and 

 taking it to pieces, they found the whole cavity, from one end to 

 the other, nearly filled with a sparry incrustation, somewhat softer 

 than marble, but harder than alabaster*. 



Strabo relates that the waters of Hierapolis, a city of Phrygia, 

 possessed this property -f. Pliny also notices similar waters J. 

 About fifteen miles from the city of Lucca, in Tuscany, is a spring, 

 which arises from a mountain named Corsena; the water of which, 

 being made to pass through pipes, soon clogs them by an accretion 

 of stony matter. 



* Pilosophical Transactions, vol. Ixviii. p. 241. 



f Strabonis de Situ Orbis, lib. xiii. p. 600. Basilae, 1549. 



J Lib. ii. cap. 103. Lib. xxxi. cap. i. 



