By the command of the President of the United States T. Lear has the honor to enclose for Mr. Jefferson’s perusal a letter from the Count d’Estaing to the President, which was alluded to by Mr. Short in the letter which Mr. Jefferson laid before the President at the time when he delivered the above letter from the Count d’Estaing, likewise two letters, a memorial, and a treatise upon establishing a uniformity of weights and measures throughout the United States, which were written and transmitted to the President by Mr. Collignon.