Earth and Shells on the Banks of York-River, Gc. 373 
{trong cement, that they fall only when undermined, and then 
in large bodies, from one to twenty tons weight: They have 
the appearance of large rocks on the fhores, and are wafted by 
the frequent wafhing of the fea. All thefe different {trata feem - 
to be perfectly horizontal. . , 
After-riding about feven miles from York-town, near the cen- . 
ter between the two rivers, I difcovered, ata place.from which a 
large body of earth had been removed to a mill-dam, nearly the 
fame appearance as in -the bank firft:mentioned,. 
What they cal their ftone, with which they build in Yorki 
town, is nothing more than fhells, united by a ftrong cement, . 
which feems to be petrified in a degree, but is DE affected 
by the weather. . 
ON ‘the ediof Auguft; being at; CarJje, in the ftate of Perm: - 
Sylvania, I went to view a fubterraneous paffage, which had ite - 
entrance near a river into a:rock. I followed it about two hun 
dred and fifty feet : to this diftance it was, in general, from fix to 
íeven feet high, and about the fame in width. At the end of 
two hundred and fifty feet it divided into three branches.—As 
they were finaller, and more c difio to.fol'o:w, and finding my- 
{elf exceedingly-chilled, one of the fickeft nights 
I ever. fuSered) I.gave tp the r seid though I had proceeded 
but about half the. diftance, as I was informed by Col. Butler; 
who had been:near the. end... It appeared to me that it-was-a 
water-courfe, as the rocks were worn fmooth,-and indented in 
the manner they ufually are.by a long running of water over 
them. The appearance over head was curious.; fome parts 
were fmooth like the fides ; other parts reprefented various 
figures, formed by the water which had penetrated through the : 
