This was Count Luigi Castiglioni, who had landed at Boston in May, and after going through New England and a part of Canada, had come to New York, whence, on the 27th of November, he had set out for the South, reaching Alexandria December 24th, and spending Christmas at Mount Vernon. Count Castiglioni was a man of science, Chevalier of the Order of St. Stephen, P. M., member of the Philosophical Society of Philadelphia, and also member of the Patriotical Society of Milan, Patrician of Milan. The book written by him, _Viaggio negli Stati Uniti_, is particularly descriptive of the useful plants to be found in this country, with a view to their introduction into Europe, either for the farm and the kitchen garden or for practical inclusion in the _materia medica_. This book and that of Dr. Schoepf, 1783-1784, give an excellent statement as to the natural history, the methods of agriculture, milling, mining, etc., of that period in the history of the fourteen States. “Alexandria,” says Count Castiglioni, “numbers 300 houses and possibly 3,000 inhabitants. At times, although the latitude is only 38 degrees 45 minutes, the cold is so great that the Potowmack may be ridden and driven over. Such freezing weather is never of long duration, and many winters the river is not frozen at all. This newly established town has already received the name and the privileges of a city, and as soon as the Potowmack is made navigable will become one of the most flourishing of the trading towns of Virginia. “When I was there the plan for the improvement of the navigation (suggested by General Washington) was beginning to be put into effect. Near Alexandria brick and tiles are made at a reasonable price, the soil thereabouts being a soft, viscous clay. They make lime there from the oyster shells, which are found in extraordinary banks. The people have two theories about these great shell banks, one being that they are due to successive inundations of the sea, the other that the aborigines assembled them, either for burial mounds or for some other religious purpose. “The morning of the 25th of December I left Alexandria and went to Mount Vernon. There I spent four memorable days. General Washington is perhaps fifty-seven years of age, a man large and strong of build, of a majestic but kindly bearing, and, notwithstanding the fatigues of war, appears not yet to be aging. This celebrated man, who began and so happily carried through the American war, seems, as it were, to have been formed by nature to free this country of European rule and to inaugurate an epoch in the history of mankind. Bred to arms, he has not neglected the study of politics, and there is probably no one in America who has a better knowledge of the present condition of the United States or more sincerely desires their welfare. May Heaven spare him many years for the good of his country, for an example to it and to Europe.