thirty years preceding; it did not prove that they had not, during that term, risen periodically above their ordinary level. What Mr. Carver relates concerning this subject, rather tends to confirm the opinion that the waters of the lake do rise. “I had like,” he says, “to have omitted a very extraordinary circumstance relative to these straits;” the Straits of Michillimakinac, between lakes Michigan and Huron. “According to observations made by the French, whilst they were in possession of the fort there, although there is no diurnal flood or ebb to be perceived in these waters, yet from an exact attention to their state, a periodical alteration in them has been discovered. It was observed, that they arose by gradual but almost imperceptible degrees, till they had reached the height of three feet; this was accomplished in seven years and a half; and in the same space of time they as gently decreased, till they had reached their former situation; so that in fifteen years they had completed this inexplicable revolution. At the time I was there, the truth of these observations could not be confirmed by the English, as they had then been only a few years in possession of the fort; but they all agreed that some alterations in the limits of the straits was apparent.” It is to be lamented that succeeding years have not thrown more light on the subject; for since the fort has been in our possession, persons competent to determine the truth of observations of such a nature, have never staid a sufficient length of time there to have had it in their power to do so. [Sidenote: LAKE ONTARIO.]