Worked flints are generally found in numbers in one place, probably formerly a station or centre of human habitation. Men were beginning to form themselves into societies, and the dwellings, first of the family and then of the tribe, rapidly gathered together near some river rich in fish, or some forest stocked with game affording plenty of food easily obtained. The caves also afford proofs of the number of men who inhabited them. In one alone, near Cracow, Ossowski discovered 876 bone implements, more than 3,000 flint objects, and thousands of fragments of pottery. From the Veyrier cave, near Mount Salève, were taken nearly 1,000 stone implements; from those of Petit Morin, 2,000 arrow-heads; from that of Côttes, on the banks of the Gartampe, more than 264 pounds’ weight of flints, some of the Moustérien and others of the Madeleine type, mixed with the bones of the rhinoceros, and of several large beasts of prey of indeterminate species. The Abbé Ducrost picked up 4,000 flints in one dwelling alone at Solutré, where the soil is calcareous and flint is not native, so that it must have been brought from a distance. More than 8,000 different objects were taken from the fine Neolithic station of Ors in the isle of Oleron; 12,000 chips of stone, bearing marks of human workmanship, were picked up in the Thayngen Cave, and more than 80,000 in the different caves of Belgium. The shelter of Chaleux alone yielded 30,000 pieces of stone, at every stage of workmanship, from the waste of the manufactory to the highly finished implement. Other explorers have been no less fortunate. The Marquis of Wavrin found in the environs of Grez no less than 60,000 worked stones belonging to no less than thirty different types, chiefly arrow-heads, some triangular, others almond-shaped, others again cutting transversely, some with and some without feathers, some stalked, others not; in a word, arrows of every known type. Nothing but an actual visit to the Royal Museum of Brussels can give any idea of the importance of the discoveries made in Belgium. The environs of Paris are, however, no less rich. As early as Palæolithic times the valleys of the Seine and its tributaries were evidently inhabited by a numerous population. M. Rivière mentions a station near Clamart, where, in a limited space, he picked up more than 900 flints, some worked, others mere chips, many of which bad been subjected to heat. A sand-pit of Levallois-Perret yielded 4,000 stone objects, and on the plateau of Champigny, full of such terrible memories for the people of France, were found nearly 1,200 flints, knives, polished hatchets, lance heads and scrapers, mixed with numerous fragments of hand-made pottery without ornamentation.