The revolution which, at the critical period of the advent of the Trench in the valley of the St. Lawrence, in the interval of sixty-eight years between the visits of Cartier and Champlain, displaced the fortified and populous Indian capital of Hochelaga and left the surrounding regions a desolate wilderness, is a mysterious event. Had Champlain been curious to learn the facts of an occurrence then so recent there could have been little difficulty in recovering the history of the exodus of the Hochelagans. But it had no interest for the French adventurers of that day. The well-fortified Wyandot towns had given place to a few ephemeral birch-bark wigwams belonging to another race; and the readiest solution of the mystery has been to ascribe the expulsion of the Wyandots, or Hurons, from their ancient home in Eastern Canada, to the Algonkins. This, as already shown, is irreconcilable with the fact that Champlain found them in friendly alliance with the latter against their common foe, the Iroquois. If, however, the Wyandot tradition of the expulsion of the Hurons from the island of Montreal by the Senecas be accepted, it is in no degree inconsistent with the circumstances subsequently reported by Champlain; but rather serves to account for some of them, if it is assumed that the Senecas were, in their turn, driven out by the Algonkins, and then finally withdrew beyond the St. Lawrence. But there is another kind of evidence bearing on the question of the affinities of the people first met with by Cartier in 1535, which also has its value here. The descriptions of the palisaded towns of the Hurons on the Georgian Bay very accurately reproduce that which Cartier gives of Hochelaga. Ephemeral as such fortifications necessarily were, the construction of a rampart formed of a triple row of trunks of trees, surmounted with galleries, from whence to hurl stones and other missiles on their assailants, was a formidable undertaking for builders provided with no better tools than stone hatchets, and with no other means of transport than their united labour supplied. But the design had the advantage of furnishing a self-supporting wall, and so of saving the greater labour of digging a trench, with such inadequate tools, in soil penetrated everywhere with the roots of forest trees. It was the Huron-Iroquois system of military engineering, in which they contrasted favourably with the Algonkins, among whom the absence of such evidence of settled habits as those secure defences supplied, was characteristic of these ruder nomads. But such urban fortifications no less strikingly contrast with the elaborate and enduring military earthworks to the south of the great lakes. The pottery and implements found on the site of Hochelaga are of the same character as many examples recovered from the Huron ossuaries. On the other hand the peculiar rites, of which those ossuaries are the enduring memorials, appear to have distinguished