[ 265 J 
F The bottom of the fecond (haft. 
G H A fubterraneous river, at the bottom of the 
fecond fhaftj which probably communi- 
cates with fome of the rivers in that 
great cavern at Caftleton : a circumftance 
there is reafon to fufpeft, from hence, 
that thofe rivers, on great floods, are 
obferved to caft up fmall fragments of 
a kind of grit ftone, which grows 
plentifully in the parts of the country near 
Elden Hole j but is not to be found in 
the parts near the cavern at Caftleton. 
VoL. LXI. 
M m 
XXXII. An 
