98 CONCURRENCE OF ACCIDENTS NECESSARY. 
cliffs and the face of stone quarries. 2d, The presence of bones is 
another accident, though probably not an uncommon one in those 
cavities which were accessible to the wild animals, either falling in, 
or entering spontaneously, or being dragged in by beasts of prey, 
in the period immediately preceding the deluge. 3d, A further re¬ 
quisite is, the intersection of one of these cavities, in which there 
happen to be bones, by a third accident, viz. the working of a stone 
quarry, by men who happen to have sufficient curiosity or intelligence 
to notice and speak of what they find, and this to persons who also 
happen to be willing or able to appreciate and give publicity to the 
discovery. The necessary concurrence of all these complicated con¬ 
tingencies renders it probable, that however great may be the number 
of subterraneous caverns, in an inland country, very few of them will 
ever be discovered, or if discovered, be duly appreciated. Those I 
have mentioned in Yorkshire, Devon, Somerset, Derby, and Glamor¬ 
ganshire, were all laid open, with the exception of the caves at Pavi- 
land, by the accidental operations of a quarry or mine. 
