MacEnery's researches that Buckland and others of the earlier modern geologists owed their most valuable data; and some of the rarest palæontological specimens in the British Museum originally belonged to his private collection. Kent's Hole is referred to by Professor Owen, in his History of British Fossil Mammals, as "perhaps the richest cave depository of bears hitherto found in England." The roof is clustered with pendant cones of stalactite, and the floor thickly paved with concretions of stalagmite, the accumulations of many centuries, which have sealed down the floor hermetically, and preserved the relics both of the geologist and the archæologist safe from disturbance, and protected from decay. "The floor we found, at our first visit, covered, through its whole extent, with a darkish mould, varying in depth from a few inches to a foot. It only dates since the cavern became a popular place of resort, and the further progress of the stalagmite in open situations was interrupted by the trampling of visitors. In the vestibule were found, deep imbedded in it, those curiously shaped pieces of oak to which the appellation of Druids' sandal was given,[220] together with a quantity of decomposed animal and vegetable matter, the remains of fires and feasts, mingled with rabbit bones.... "At the hazard of unnecessarily charging the thread of my narrative with seemingly frivolous particulars, I proceed to note down the characters presented by its general aspect, no less than its contents, before it was altered by those operations which have since left no part of it in its virgin state. It is only on a just appreciation of all their circumstances that a true estimate can be founded of those facts which should serve as the basis of all reasoning on its nature and history. "The floor of the entrance, except that it had the appearance of being broken up, offered nothing remarkable to detain us; we shall have occasion to return to it presently. Not so the lateral branch by which it communicates with the body of the cavern on the left. Under a ledge on the left was found the usual sprinkling of modern bones, and, in the mould beneath, which had acquired the consistence of hard clay, were fragments of pottery, calcined bones, charcoal, and ashes; in the midst of all were dispersed arrow-heads of flint and chert. The ashes furnished a large proportion of the mould.