The last city I shall commemorate is called after a famous stronghold in Europe, being seated on a ledge of rocks extending from the Illinois into the prairie, and apparently inaccessible on all sides. It is certainly a capital position in a military point of view, and would be invaluable on a frontier. People might live there in great security if they could find any thing to eat. At present the only enemy they would have to fear is famine. Luckily, however, there are no inhabitants, and one need be under no apprehensions on that score. It is a most picturesque spot, the mossy rocks every where interspersed with flowers and verdure, and the summit crowned with an open wood of lofty trees, under which the grass is as green and luxuriant as a lowland meadow. There are several other cities, lying dormant, between this and the town of Ottawa, and no one can predict their future destinies. When the canal connecting the Mississippi and the lakes comes to be finished, as I hope it soon will be, for it is a great national undertaking, and will form the last link to the most extensive inland navigation in the world, there can be little doubt, I think, that this will become a very busy and populous region. Towns will rise up as a matter of course; and, provided they do not ruin each other by their numbers and their rivalry, will flourish to a considerable extent. Those, therefore, who have the wealth of Crœsus, and the patience of Job, may, if they please, speculate in town-lots in these embryo cities, for the benefit of their posterity. The gallant adventurer La Salle is worthily commemorated in this quarter, by a town and a county called after his name. Among all the hardy and daring pioneers, of the Mississippi valley and the lakes, he stands foremost, and best merits the remembrance and gratitude of the millions who are now enjoying the fruits of his enterprise and sufferings. He built the first vessel that ever floated on the lakes; he explored the Upper and Lower Mississippi, and perished at last by the hands of his companions, who finally shrunk from the perils and privations which he bore without flinching. Mr. Adams, when Secretary of State, in a correspondence with Don Leviz de Onis, the Spanish minister, on the subject of boundaries, pays a most eloquent, well deserved tribute to the genius, hardihood, courage and enterprise of Louis La Salle, but with this exception he has not met with that attention he so justly merits from my countrymen.