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It would be a serious omission not to include in this catalogue at least a mention of the portages which completed the line of communication along the chain of the Great Lakes—or from the St. Lawrence across to the extremity of Lake Superior. The importance of the portage from the Ottawa to Lake Nipissing and French River has been fully suggested, in our emphasis of the use of the Ottawa route, by which the French avoided the Iroquois and gained the western lakes. The historic and economic phase of the Niagara River offers a magnificent untouched field for historic study. The series of forts and their varying flags which defended this key of the Lakes; the struggle for their possession; the portage routes here that were of such vital importance to all the West; the earliest systems of transportation around Niagara Falls; the supplementary roundabout routes, such as up Grand River; and finally, the building of the Welland Canal, offer a splendid topic for study and field work. At the extremity of Lake Superior was the Grand Portage, which joined the Great Lakes with Hudson Bay, by way of