Of camps there are two sorts, but we cannot be sure that they belong to different races of men. The stone-walled fortresses are few--Brent Tor, Whit Tor, Cranbrook, one near Ashburton, and the Dewerstone. Of earth, or earth and stone mixed, there are more. A small one above Tavistock, an immense and very important one at Galford or Burleigh in Bridestowe, one above the station at Okehampton, Wooston and Prestonbury on the Teign, Holne and Hembury on the Dart. Along the south of the moor are none till we reach Boringdon, between the Plym and the Tory. But one only of all these has been systematically explored, and that is, perhaps, the finest, on Whit Tor, above Mary and Peter Tavy. Whit Tor rises to the height of 1,526 feet above the sea-level. It is on Cudlipptown Down, and commands exceedingly fine views westward as far as the distant Cornish hills. The tor is not of granite, but of gabbro, an eruptive igneous rock, very black and hard, and splitting along defined planes under the action of the weather. The north side near the summit is covered with a clitter of broken masses. The boldest masses of rock rise on the south precipitously, but there are fangs of rock that shoot up over the small plateau that forms the summit of the hill. The whole of the summit is surrounded by a double wall in a very ruinous condition, and this is to a considerable extent due to the smallness of the stones of which it was composed. The faces of the walls were to be traced only by digging, and were never more than doubtful. Both walls appear to have been 10 feet thick, perhaps a little more; the outer, when perfect, might have had a height of 4 to 4½ feet, whilst the inner, judged by the débris, appears to have been 6 to 7 feet high. The space between the walls varied, owing to the inequalities of the ground, but was generally 10 feet wide. The area inclosed by the innermost wall amounts to close on one and a half acres; the total amount included within the outer wall is about two and a half acres of ground. The circumference is very much broken up, as is also the inclosed area, by considerable masses of protruding rocks. About these, within the camp, heaps of small stones had been piled up, forming cairns. The largest and most notable of these is at the south-west, and consists of a core of rock about which an immense accumulation of stones has been heaped. All these cairns were thoroughly explored. They covered no interments, and although they disclosed evidences that fires had been lighted against the rocks, and that people had camped there for a while, they showed no tokens of structural erection, as though they were ruinous huts built against the native rock. The huge cairn was removed with great labour, and revealed nothing whatever beneath it but one flint flake. These cairns, there can be little doubt, were collections of stones for the use of the besieged, to serve as missiles, or for the repair of the walls.