An interesting letter from the Patent Office to the Congressional Committee on Agriculture, briefly reviewing what has been done in the way of naturalizing foreign herbs and plants in the United States, has appeared. Everybody knows that some years ago, on the representation of the Patent Office, instructions were sent to our representatives abroad, and to the naval officers on foreign stations, to collect seeds and bulbs and cuttings of foreign growth, and to send them home for trial here. The plan has been in operation but a short while, and the appropriations made for it have been small, but the results, as given in Mr. Brown's report, are already very gratifying. Most farmers are acquainted with the "Mediterranean wheat," which ripens, in great abundance, earlier than our common varieties; a few years ago it was unknown here. From France we have obtained two Chinese plants, which the enterprise of French agriculturists domiciliated some time since on French soil - the "Chinese yam" - a very fair substitute for the potato, and the "Chinese sugar-cane," one acre of which produces twenty-five tons of fodder, of the most nutritious and excellent kind.

Another good forage crop has been obtained from the "chufa," a plant of Spanish origin; and yet a third from the Moha de Hongrie, from France. Cuttings of foreign plum-trees have been imported in large quantities, and engrafted upon the common plum with such success, that we may shortly expect to produce all our own dried prunes. It is now proposed to import more largely than heretofore, in fact, to obtain from abroad every plant, herb or tree which has been cultivated successfully anywhere. For this, larger appropriations than usual will be necessary. That Congress ought to grant them, there can be no question. - Nat, Intelligencer.