From the United States boundary line southward it is a distance of seven miles to Isle la Motte, which island is five and a half miles long by one and three quarters wide, with a light-house upon its northwest point. From the New York shore of Monti Bay, across the end of Isle la Motte to St. Albans, Vermont, is a distance of thirteen and a half miles. Two miles south of the island, on the west shore, is Point au Roche light; and two miles and three quarters south of it is Rocky Point, the terminus of Long Point. Next comes Treadwell Bay, three miles across; then two miles further on is Cumberland Head and its light-house. West from Cumberland, three miles across a large bay, is Plattsburgh, at the mouth of the Saranac River, a town of five thousand inhabitants. In this vicinity Commodore Macdonough fought the British fleet in 1814. These are historic waters, which have witnessed the scene of many a bloody struggle between French, English, and Indian adversaries. Off Cumberland Head, and dividing the lake, is Grand Isle, twelve miles in length and from three to four in width. The village of Port Kent is near the mouth of the Ausable River, which flows out of the northern Adirondack country. A few miles from the lake is the natural wonder, the Ausable Chasm, which is nearly two miles in length. The river has worn a channel in the Potsdam sandstone formation to a depth, in places, of two hundred feet. Between high walls of rock the river is compressed in one place to ten feet in breadth, and dashes wildly over falls and rapids on its way to Lake Champlain. It is said to rival the famous Swiss Gorge du Triant. Schuyler's Island, upon the shore of which we passed Tuesday night, is nearly in the latitude of Burlington, Vermont. The distance from Port Douglass on the west, to Burlington on the east side of Champlain, over an open expanse of water, is nine miles and three quarters. We breakfasted by starlight, and passed Ligonier's Point early in the day. One mile and a half east of it is the group of little islands called Four Brothers. The lake grew narrower as we rowed southward, until, after passing Port Henry Iron Works, and the high promontory of Crown Point, upon which are the ruins of the French Fort Frederic, built in 1731, it has a width of only two miles. At eight o'clock P. M. we dropped anchor under the banks of Ticonderoga, not far from the outlet of Lake George. It is four miles by road between the two lakes. The stream which connects them can be ascended from Champlain about two miles to the Iron Works, the remainder of the river being filled with rapids.