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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 Guankabalika 
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 perpendicularly, 
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 
1/66, was in about three years time, or rather less, found to be 
much obstructed, and stopped up, so that, in August, 1^69, 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 +. 
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. 
* Philosophical Transactions, vol. Ixviii. p. 241. 
f Strabonis de Situ Orbis, lib. xiii. p. 600. Basilse, 1549. 
Lib. ii. cap. 103. Lib. xxxi. cap. i. 
