1803.] 
defcription ; but it is expeéted, that the 
annexed diagram will reprefent not only 
#he parts pafled over in filence, but alfo 
Tue CAVE ar 
A, reprefents the mouth. of the cave. 
B, a {mall aperture not explored. C, the- 
junction of the two paffages. D, acir- 
cular pool of water two feet in depth, fi- 
tuated about four hundred yards from the 
entrance. E and F, the commencement 
of the perpendicular chafm. G, the large 
pool of water. H, the place where the 
brook difappears. I, the back gallery. 
K, the impaffible branch. ‘The parallel 
lines fhew the tract; and the marks 
acrofs the lines denote the fteps to be 
afcended. . 
The above-mentioned ingenious gen- 
tlemen, having explored the circuit of 
this fubterraneous labyrinth, immediately 
underftood the caufe of a circumftance, 
which has greatly perplexed the inhabit- 
ants of Afby, perhaps for ages. ‘The 
reafon of the loud and jingling noile, 
which is frequently heard three or four 
hours before water iffues out of the cave, 
is thus to be explained: the rain falling 
mto the crevices of the limeftone in the 
higher grounds, forms anumber of fub- 
terraneous brooks, which flow into the 
Defcrigtion of the Cave at Great Afby. 
105 
an outline of the whole, better than words 
can expref{s. 
GREAT ASBY, 
Seftion of the chafm between the twa 
pools, fuppofing it filled up with 
‘clay as far as a 
figure of the cave. 
remoter parts of the cavern, through the © 
apertures before defcribed. When the 
back apartments are filled to the common 
level, the water begins to defcend the 
floping floor of the front gallery. The 
noife occafioned in falling from the feveral 
fteps of the interjacent firata, the {mall 
funnels fituated in the roof, and the re- 
percuffion of the vaulted dome, are the 
caufe of the thundering found which is 
heard; and it is evident, that a current 
cannot iffue out of the mouth of this fub- 
terraneous recefs, till the cave be entirely 
full. No fpecimens of dropftone being 
found in the place, induced a belief, that 
the agitation of the water, in the different 
paflages, is generally violent. 
This cavern exhibits fome of the phe- 
nomena obfervable in a cave at Zircknitz, 
in Carniola; for an account of which fee 
the fecond volume of the Philofophical 
Tranfaions of the Royal Society, 
abridged by Lowithorp. 
Ravenftonedale, Iam, your’s, &c. 
Fan, 315 1303. Joon ROBINSON. 
4 ) Io 
