The traces of Palaeolithic man are very numerous, and he evidently exercised great skill in bringing his implements to a symmetrical shape by chipping. The use of metals for cutting purposes was entirely unknown; and stone, wood, and bone were the only materials of which these primitive beings availed themselves for the making of weapons or domestic implements. Palaeolithic man lived here during that distant period when this country was united with the Continent, and when the huge mammoth roamed in the wild forests, and powerful and fierce animals struggled for existence in the hills and vales of a cold and inclement country. His weapons and tools were of the rudest description, and made of chipped flint. Many of these have been found in the valley gravels, which had probably been dropped from canoes into the lakes or rivers, or washed down by floods from stations on the shore. Eighty or ninety feet above the present level of the Thames in the higher gravels are these relics found; and they are so abundant that the early inhabitants who used them must have been fairly numerous. Their shape is usually oval, and often pointed into a rude resemblance of the shape of a spear-head. Some flint-flakes are of the knifelike character; others resemble awls, or borers, with sharp points evidently for making holes in skins for the purpose of constructing a garment. Hammer-stones for crushing bones, tools with well-wrought flat edges, scrapers, and other implements, were the stock-in-trade of the earliest inhabitant of our country, and are distinguishable from those used by Neolithic man by their larger and rougher work. The maker of the old stone tools never polished his implements; nor did he fashion any of those finely wrought arrowheads and javelin points, upon which his successor prided himself. The latter discovered that the flints which were dug up were more easily fashioned into various shapes; whereas Palaeolithic man picked up the flints that lay about on the surface of the ground, and chipped them into the form of his rude tools. However, the elder man was acquainted with the use of fire, which he probably obtained by striking flints on blocks of iron pyrites. Wandering about the country in families and tribes, he contrived to exist by hunting the numerous animals that inhabited the primeval forests, and has left us his weapons and tools to tell us what kind of man he was. His implements are found in the drift gravels by the riversides; and from this cause his race are known as drift men, in order to distinguish them from the _cave men_, who seem to have belonged to a little later period.