The next race that entered our island found the temperature much as it is now. They were comparatively civilised. They still used flint implements, but of a very superior type, and far better finished than those of the earlier race. Moreover they were agricultural, grew corn, had cows and sheep and dogs, and made pottery. This race it was which erected the so-called cromlechs, stone circles, and tall upright stones. The remains of their villages of circular stone huts are very numerous on the moors. This period is called the Neolithic, or New Stone Age. After a time bronze was introduced, by trade, and was at first as valuable as gold is to us. But after a while it became much more common. Its introduction marked the commencement of the Bronze Age. To the Bronze Age succeeded the Iron Age. This metal was introduced by the conquering Celts, of whom there existed two branches, one called Brythonic, of which were the Britons, now represented by the Welsh, the Cornish, the Cumbrians, and the Bretons of Brittany; the other called Goidelic, and now represented by the Irish, the natives of the Isle of Man, and the Scots. The Celts with their iron weapons speedily overcame and enslaved the earlier race, usually called Ivernian. The latter was dusky and dark haired, but the Celt probably had yellow or red hair, blue or grey eyes, and a fair complexion. No satisfactory evidence has been produced that Palaeolithic man occupied Cornwall, but the traces of Neolithic man at the stage when he became acquainted with the use of bronze are abundant. By him were erected the rude stone monuments that are scattered over the county, and he had his favourite sites for trimming flints into scrapers and arrow-heads. One of the most notable of these was the shore of Dozmare Pool. Of the rude stone monuments the dolmen or cromlech is sepulchral, the dolmen when large having been a tribal or family mausoleum, and the kistvaen, which is far smaller, contained the bones of one individual alone. The dolmen is composed of three or more upright stones sustaining one or more coverers, and was often buried under a cairn. The finest in Cornwall are Zennor and Lanyon Quoits, the Trethevy Stone, and Chûn Quoit. Stone circles are numerous. Their purpose has not been determined, but on Dartmoor, where they have been examined, they exhibit a floor strewn with charcoal. They have, moreover, usually numerous cairns or barrows associated with them. The finest sacred circle is that of the Stripple Stones on the Bodmin moors, but this has of late years been sadly mutilated. The "Merry Maidens," in St Buryan's parish near Penzance, is a magnificent circle. Other circles are those of Boscawen-ûn, Dauns Môr, Wendron, the Trippet Stones on Blisland moor, Fernacre and Stannon on the St Breward moors, the Hurlers near the Cheesewring, the Nine Maidens in St Columb Major, Duloe, etc. [Illustration: Lanyon Cromlech]