The Lake dwellings of Switzerland may be assigned to three different periods. That of Chavannes, on Lake Bienne, belongs to the earliest type. The hatchets found are small, scarcely polished, and always of native rock, such as serpentine, diorite, or saussurite; the pottery is coarse, mixed with grains of sand or bits of quartz; the bottoms of the vases are thick, and no traces of ornamentation can be made out. The pile-dwellings of the second period, such as those of Locras and Latringen, show considerable progress; the hatchets, some of which are very large, are well made. Several of them are of nephrite, chloromelanite, and jade; and their number, as compared with those in minerals native to Switzerland, varies from five to eight per cent. Here and there in rare instances we find a few copper or bronze lamellae amongst the piles. The pottery is now of finer clay, better kneaded; and ornamentation, including chevrons, wolves’ teeth, and mammillated designs, is more common. The handle, however, is still a mere projection. The third period, which we may date from the transition from stone to bronze, is largely represented; copper weapons and tools are already numerous, and bronze is beginning to occur. The stone hatchets and hammers are skilfully pierced, and wooden or horn implements are often found. The vases are of various shapes, all provided with handles, and are covered with ornaments, some made with the fingers of the potter, others with the help of a twig or some fine string. On the other hand, there are no hatchets of foreign rock; commerce and intercourse with people at a distance had ceased, or at least become rarer. The tools are fixed into handles of stag horn, which are found in every stage of manufacture. The personal property of the Lake Dwellers included bead necklaces, pendants, buttons, needles, and horn combs. The teeth of animals served as amulets, and the bones that were of denser material than born were used as javelin- or arrow-heads. The arrows were generally of triangular shape and not barbed.11