In the autumn of 1784, General Washington made a tour as far west as Pittsburgh; after returning from which, his first moments of leisure were devoted to the task of engaging his countrymen in a work which appeared to him to merit still more attention from its political, than from its commercial influence on the union. In a long and interesting letter to Mr. Harrison, then governor of Virginia, he detailed the advantages which might be derived from opening the great rivers, the Potomac and the James, as high as should be practicable. After stating with his accustomed exactness the distances, and the difficulties to be surmounted in bringing the trade of the west to different points on the Atlantic, he expressed unequivocally the opinion, that the rivers of Virginia afforded a more convenient, and a more direct course than could be found elsewhere, for that rich and increasing commerce. This was strongly urged as a motive for immediately commencing the work. But the rivers of the Atlantic constituted only a part of the great plan he contemplated. He suggested the appointment of commissioners of integrity and abilities, exempt from the suspicion of prejudice, whose duty it should be, after an accurate examination of the James and the Potomac, to search out the nearest and best portages between those waters and the streams capable of improvement, which run into the Ohio. Those streams were to be accurately surveyed, the impediments to their navigation ascertained, and their relative advantages examined. The navigable waters west of the Ohio, towards the great lakes, were also to be traced to their sources, and those which empty into the lakes to be followed to their mouths. "These things being done, and an accurate map of the whole presented to the public, he was persuaded that reason would dictate what was right and proper." For the execution of this latter part of his plan he had also much reliance on congress; and in addition to the general advantages to be drawn from the measure, he laboured, in his letters to the members of that body, to establish the opinion, that the surveys he recommended would add to the revenue, by enhancing the value of the lands offered for sale. "Nature," he said, "had made such an ample display of her bounties in those regions, that the more the country was explored, the more it would rise in estimation."