The rock basins are numerous; they are hollow pans formed on the surface of granite slabs by the action of wind and water, assisted by particles of grit set in rotation by the wind. "That this rude and primitive species of basin formed part of the apparatus of Druidism there can be little doubt," says Mr. Rowe, "but the specific purpose for which they were designed is not clear." Fosbroke unhesitatingly pronounces rock basins to be "cavities _cut_ in the surface of a rock, supposed for reservoirs, to preserve the rain or dew in its original purity, for the religious uses of the Druids." [Illustration: ROOS TOR, WITH ITS LOGANS, PREVIOUS TO DESTRUCTION.] All this assertion must be put aside. The bowls are excavated by natural agencies, and there is not a scrap of evidence to show that they were put to superstitious or any other use. The largest is on Caistor Rock, and this has been railed round, as sheep floundered in and got drowned, or could not get out again. Mis Tor has a fine basin, called "The Devil's Frying-pan." These basins may be seen in all stages of growth on the tops of the tors. The tolmen is either a holed stone or a rock supported in such a manner as to preserve it from falling, and supposed to have been used as an apparatus of ordeal, by requiring those accused of a crime to creep through the orifice. Holed stones have unquestionably been employed for the purpose of taking oaths and sealing compacts, the hands being passed through an opening and clasped. And certainly S. Wilfrid's needle, in the crypt under Ripon Minster, was made use of as a test to try whether a maiden accused of incontinency was guilty or not. There is, however, no well-defined tolmen on Dartmoor that can be pronounced to be artificial. A holed stone in the Teign was pierced by the action of the water, and a suspended rock at an incline on Staple Tor, called by Mrs. Bray and Mr. Rowe a tolmen, is a natural production also. It is, of course, possible that stones thus poised may have been employed for the purpose, but we have no evidence that those on Dartmoor were so used. Of rocks supported at one end by a small stone there are plenty. There is a good one on Yar Tor, above Dartmeet. The old school of antiquaries started with a theory, and then sought for illustrations to fit into their theories, and took facts and distorted them to serve their purpose, or saw proofs where no proofs existed. The new school accumulates statistics and piles up facts, and then only endeavours to work out a plausible theory to account for the facts laboriously collected and registered. It never starts with a theory, but applies practices in savage life still in use to explain the customs of prehistoric men, who lived on the same cultural level as the savages of the present day.