One fruitful source of knowledge about Neolithic life comes from Switzerland, and was first revealed by the very dry winter of 1854, when the water level of one of the lakes, sinking to an unheard-of lowness, revealed the foundations of prehistoric pile dwellings of the Neolithic and early Bronze Ages, built out over the water after the fashion of similar homes that exist to-day in Celebes and elsewhere. Not only were the timbers of those ancient platforms preserved, but a great multitude of wooden, bone, stone, and earthenware utensils and ornaments, remains of food and the like, were found in the peaty accumulations below them. Even pieces of net and garments have been recovered. Similar lake dwellings existed in Scotland, Ireland, and elsewhere--there are well-known remains at Glastonbury in Somersetshire; in Ireland lake dwellings were inhabited from prehistoric times up to the days when O’Neil of Tyrone was fighting against the English before the plantation of Scotch colonists to replace the Irish in Ulster in the reign of James I of England. These lake villages had considerable defensive value, and there was a sanitary advantage in living over flowing water. Probably these Neolithic Swiss pile dwellings did not shelter the largest communities that existed in those days. They were the homes of small patriarchal groups. Elsewhere upon fertile plains and in more open country there were probably already much larger assemblies of homes than in those mountain valleys. There are traces of such a large community of families in Wiltshire in England, for example; the remains of the stone circle of Avebury near Silbury mound were once the “finest megalithic ruin in Europe.”[54] It consisted of two circles of stones surrounded by a larger circle and a ditch, and covering all together twenty-eight and a half acres. From it two avenues of stones, each a mile and a half long, ran west and south on either side of Silbury Hill. Silbury Hill is the largest prehistoric artificial mound in England. The dimensions of this centre of a faith and a social life now forgotten altogether by men indicate the concerted efforts and interests of a very large number of people, widely scattered though they may have been over the west and south and centre of England. Possibly they assembled at some particular season of the year in a primitive sort of fair. The whole community “lent a hand” in building the mounds and hauling the stones. The Swiss pile-dwellers, on the contrary, seem to have lived in practically self-contained villages. [Illustration: Pottery from Lake Dwellings J.F.H. (after a drawing in Déchelette’s “Manuel d’Archéologie”)] [Illustration: Restoration of a Lake dwelling]