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bad been penetrated by the {tony particles ; and 
thus, {{retching itfelf to a confiderable extent, it 
•ihas, in fome places, been mixed and interwoven 
with other fubitances. In fome parts, In ails have 
been arrefled in their fluggilh walks, and locked 
up in the ftony concrete. In others, the petrify- 
ing matter has (hot, in different diredtions, and 
formed an intricate kind of net-work. And in 
Others again, there are large mafles, which, on 
being broken afunder, are found hollow ; and 
their cavities ornamented with branches of petri- 
faction, fomewhat refembling coral, but of a 
darkifh-white colour, and generally of a rough 
-and granulated furface. 
Under the Stratum there is, from a foot to a 
foot and a half, of good foil ; and immediately 
under this lies the limeftone rock. The foil is 
of the fame nature with that of the adjoining 
fields, which form the dope of the hill, and is 
evidently a continuation of that foil. 
Any further additions, to this petrified Stratum 
are now inconfiderable, and in many places none 
at all ; for the two principal fprings are confined 
to their channels, covered from the day, through 
the greateft part of their courfe, and are rapid in 
their motion. 
Had proper obfervations been made on the pro- 
grefs of this Stratum , a tolerably exact eitimate 
might have been formed, with refpebt to the time, 
when thefe waters were fir ft impregnated with 
their mineral ingredients. From thefe two con- 
fiderations, however, that the Stratum is not very 
thick, and that the foil, immediately under it, is a 
continu- 
