_Rappahannock_ affords four fathom water to Hobb's hole, and two fathom from thence to Fredericksburg. _Potomac_ is seven and a half miles wide at the mouth; four and a half at Nomony bay; three at Aquia; one and a half at Hallowing point; one and a quarter at Alexandria. Its soundings are seven fathom at the mouth; five at St. George's island; four and a half at Lower Matchodic; three at Swan's point, and thence up to Alexandria; thence ten feet water to the falls, which are thirteen miles above Alexandria. These falls are fifteen miles in length, and of very great descent, and the navigation above them for batteaux and canoes is so much interrupted as to be little used. It is, however, used in a small degree up the Cohongoronta branch as far as fort Cumberland, which was at the mouth of Willis's creek; and is capable, at no great expense, of being rendered very practicable. The Shenandoah branch interlocks with James river about the Blue Ridge, and may perhaps in future be opened. The _Mississippi_ will be one of the principal channels of future commerce for the country westward of the Alleghany. From the mouth of this river to where it receives the Ohio, is one thousand miles by water, but only five hundred by land, passing through the Chickasaw country. From the mouth of the Ohio to that of the Missouri, is two hundred and thirty miles by water, and one hundred and forty by land, from thence to the mouth of the Illinois river, is about twenty-five miles. The Mississippi, below the mouth of the Missouri, is always muddy, and abounding with sand bars, which frequently change their places. However, it carries fifteen feet water to the mouth of the Ohio, to which place it is from one and a half to two miles wide, and thence to Kaskaskia from one mile to a mile and a quarter wide. Its current is so rapid, that it never can be stemmed by the force of the wind alone, acting on sails. Any vessel, however, navigated with oars, may come up at any time, and receive much aid from the wind. A batteau passes from the mouth of Ohio to the mouth of Mississippi in three weeks, and is from two to three months getting up again. During its floods, which are periodical as those of the Nile, the largest vessels may pass down it, if their steerage can be insured. These floods begin in April, and the river returns into its banks early in August. The inundation extends further on the western than eastern side, covering the lands in some places for fifty miles from its banks. Above the mouth of the Missouri it becomes much such a river as the Ohio, like it clear and gentle in its current, not quite so wide, the period of its floods nearly the same, but not rising to so great a height. The streets of the village at Cohoes are not more than ten feet above the ordinary level of the water, and yet were never overflowed. Its bed deepens every year. Cohoes, in the memory of many people now living, was insulated by every flood of the river. What was the eastern