This morning I came down early to the steam-boat, attended by a _cortège_ of amiable people, who had heard of my sojourn at Detroit too late to be of any solace or service to me, but had seized this last and only opportunity of showing politeness and good-will. The sister of the governor, two other ladies, and a gentleman, came on board with me at that early hour, and remained on deck till the paddles were in motion. The talk was so pleasant, I could not but regret that I had not seen some of these kind people earlier, or might hope to see more of them; but it was too late. Time and steam wait neither for man nor woman: all expressions of hope and regret on both sides were cut short by the parting signal, which the great bell swung out from on high; all compliments and questions "fumbled up into a loose adieu;" and these new friendly faces--seen but for a moment, then to be lost, yet not quite forgotten--were soon left far behind. The morning was most lovely and auspicious; blazing hot though, and scarce a breath of air; and the magnificent machine, admirably appointed in all respects, gaily painted and gilt, with flags waving, glided over the dazzling waters with an easy, stately motion. I had suffered so much at Detroit, that as it disappeared and melted away in the bright southern haze like a vision, I turned from it with a sense of relief, put the past out of my mind, and resigned myself to the present--like a wise woman--or wiser child. The captain told me that last season he had never gone up the lakes with less than four or five hundred passengers. This year, fortunately for my individual comfort, the case is greatly altered: we have not more than one hundred and eighty passengers, consequently an abundance of accommodation, and air, and space--inestimable blessings in this sultry weather, and in the enjoyment of which I did not sympathise in the lamentations of the good-natured captain as much as I ought to have done. PASS SNAKE ISLAND. We passed a large and beautifully green island, formerly called Snake Island, from the immense number of rattlesnakes which infested it. These were destroyed by turning large herds of swine upon it, and it is now, in compliment to its last conquerors and possessors, the swinish multitude, called Hog Island. This was the scene of some most horrid Indian atrocities during the Pontiac war. A large party of British prisoners, surprised while they were coming up to relieve Detroit, were brought over here, and, almost within sight of their friends in the fort, put to death with all the unutterable accompaniments of savage ferocity. I have been told that since this war the custom of torturing persons to death has fallen gradually into disuse among the Indian tribes of these regions, and even along the whole frontier of the States an instance has not been known within these forty years. ASCEND THE ST. CLAIR.