DEAR SIR,--I received your favor of the 14th of October in the moment I was setting out on a tour of the sea-port towns of this country, from which I have been not long returned. I received it, too, with that kind of heartfelt pleasure which always attends the recollection of ancient affections. I was glad to find that the adaptation of your rice to this market was considered worth attention, as I had supposed it. I set out from hence impressed with the idea the rice-dealers here had given me, that the difference between your rice and that of Piedmont proceeded from a difference in the machine for cleaning it. At Marseilles I hoped to know what the Piedmont machine was; but I could find nobody who knew anything of it. I determined, therefore, to sift the matter to the bottom, by crossing the Alps into the rice country. I found their machine exactly such a one as you had described to me in Congress in the year 1783. There was but one conclusion then to be drawn, to wit, that the rice was of a different species, and I determined to take enough to put you in seed; they informed me, however, that its exportation in the husk was prohibited, so I could only bring off as much as my coat and surtout pockets would hold. I took measures with a muleteer to run a couple of sacks across the Apennines to Genoa, but have not great dependence on its success. The little, therefore, which I brought myself, must be relied on for fear we should get no more; and because, also, it is genuine from Vercilli, where the best is made of all the Sardinian Lombardy, the whole of which is considered as producing a better rice than the Milanese. This is assigned as the reason for the strict prohibition. Piedmont rice sold at Nice, (the port of its exportation,) when I was there, at seventeen livres French, the French hundred weight. It varies from time to time as the price of wheat does with us. The price of Carolina rice at Bordeaux, Nantes, L'Orient and Havre, varies from sixteen florins to twenty-four florins the French quintal, which is equal to one hundred and nine pounds our weight. The best ports to send it to are Bordeaux and Havre, (or Rouen, which is the same thing as Havre,) but it is essential that it arrive here a month before the commencement of Lent, when the principal demand is made for it. Carolina rice, after being sorted here into several qualities, sells from six sols to ten sols the French pound, retail, according to the quality. Unsorted and wholesale about thirty florins the French quintal. Piedmont rice is of but one quality, which sells at retail at ten sous the French pound, and wholesale is about three or four livres dearer than yours. In order to induce your countrymen to ship their rice here directly, I have proposed to some merchants here to receive consignments, allowing the consigner to draw in the moment of shipping for as much as he could sell on the spot, and the balance when it should be sold. But they say this is impossible.