15 
fying glass, exactly like the surrounding surface ; but the 
appearance of antiquity which would thence attach to the 
indentation, were it really an incision, may, as it seems to me, 
be readily explained on the presumption of its being merely an 
accidental impression.”* Thus the artificial incision on the 
horn of a reindeer turns out to be an accidental impression on 
the rib of a bear. 
A nearly round pebble of silicious sandstone about the size 
of a cricket-ball was found in the gravel-bed below the bone- 
earth. It is said to bear distinct marks of having been used 
as a hammer-stone. Mr. Prestwich considers that it is a 
Budleigh-Salterton pebble, that “ it seems to have been brought 
from a distance, and could not have been introduced by natural 
causes into the cave.” t Mr. Pengelly describes it as “ com- 
posed of very compact grit, approaching to quartzite,” J and 
adds, “ that a drab pebble of fine-grained grit or quartzite was 
found in Kent's Cavern, and bore no indications of having been 
used as a hammer-stone, and that such stones are somewhat 
common on all the raised beaches of Devonshire.” J That 
Budleigh-Salterton pebbles are found in raised beaches, and 
have been drifted great distances, we learn from Mr. Prestwich 
himself in his excellent paper on the Quaternary Phenomena 
in the Isle of Portland. § And when we consider that these 
pebbles are derived from Silurian strata, and must have been 
drifted eastward from the ancient rocks of South Devon or 
Cornwall ; || that they are found in the drift gravels of South- 
eastern Devonshire, scattered over the surface of the land from 
the bottoms of the valleys, up the slopes to the summits of the 
hills ; and that in this case the pebble is actually embedded 
in drifted gravel, precisely similar to that of the neighbouring 
raised beaches ; ** it is difficult to come to any other conclu- 
sion than that it had been introduced into the cavern by natural 
causes, and battered, no doubt, by a thousand storms. 
“ The Charcoal Bed.” — Mr. Bristow, in his notes on his 
survey of the cavern, tells us that “ for some distance from the 
entrance (33 to 34 feet) a dark-coloured deposit rests upon 
the bed just noticed (the cave-earth) ; it is composed of small 
angular fragments of limestone, with a white powder embedded 
in a brown, loamy base. From the circumstance of its being 
* Report, p. 537. t Ibid., p. 564. 
+ Devon Association Transactions, vol. vi. p. 803. 
§ Journal of Geological Society, No. cxxi. p. 44. || Ibid. 
IT Denudation of Rocks in Devonshire, by W. Pengelly, F.R.S., p. 19. 
** Report on Brixha/m Cavern. Notes by Mr. Bristow, p. 496. 
