It has been supposed, from another series of wrought flints, found at Saint-Acheul by Boucher de Perthes, that the men of the epoch of the great bear and mammoth may have executed certain rough sketches of art-workmanship, representing either figures or symbols. Boucher de Perthes has, in fact, found flints which he considered to show representations, with varying degrees of resemblance, of the human head, in profile, three-quarter view, and full face; also of animals, such as the rhinoceros and the mammoth. There are many other flints, evidently wrought by the hand of man, which were found by Boucher de Perthes in the same quaternary deposits; but it would be a difficult matter to decide their intention or significance. Some, perhaps, were religious symbols, emblems of authority, &c. The features which enable us to recognise the work of man in these works of antediluvian art, are the symmetry of shape and the repetition of successive strokes by which the projecting portions are removed, the cutting edges sharpened, or the holes bored out. The natural colour of all the wrought flints we have just been considering, which bring under our notice the weapons and utensils of man in the earliest epoch of his existence, is a grey which assumes every tint, from the brightest to the darkest; but, generally speaking, they are stained and coloured according to the nature of the soil from which they are dug out. Argillaceous soils colour them white; ochreous gravels give them a yellowish brown hue. Some are white on one side and brown on the other, probably from having lain between two different beds. This _patina_ (to use the established term) is the proof of their long-continued repose in the beds, and is, so to speak, the stamp of their antiquity. CHAPTER III. The Man of the Great Bear and Mammoth Epoch lived in Caverns--Bone Caverns in the Quaternary Rock during the Great Bear and Mammoth Epoch--Mode of Formation of these Caverns--Their Division into several Classes--Implements of Flint, Bone, and Reindeer-horn found in these Caverns--The Burial-place at Aurignac--Its probable Age--Customs which it reveals--Funeral Banquets during the Great Bear and Mammoth Epoch. Having given a description of the weapons and working implements of the men belonging to the great bear and mammoth epoch, we must now proceed to speak of the habitations. Caverns hollowed out in the depth of the rocks formed the first dwellings of man. We must, therefore, devote some degree of attention to the simple and wild retreats of our forefathers. As the objects which have been found in these caverns are both numerous and varied in their character, they not only throw a vivid light on the manners and customs of primitive man, but also decisively prove the fact of his being contemporary with mammals of species now extinct, such as the mammoth, the great bear, and the _Rhinoceros tichorhinus_.