Sir,--I find among the letters to Mr. Jay, one on the subject of the vibrating rod thought of by you for a standard of measure; and I have received from Mr. Madison a manuscript pamphlet of yours on the same subject. Congress having referred to me to propose a plan of invariable measures, I have considered maturely your proposition, and am abundantly satisfied of its utility; so that if I can have your leave, I mean to propose in my report to adopt the rod in preference to the pendulum, mentioning expressly that we are indebted to you for the idea. Should they concur with me in opinion, it is possible that in carrying it into execution we may have occasion to engage your assistance in the proper adjustment of it, as well on account of your abilities in that line generally, as for the peculiar interest you would feel in the success of the experiment. Mr. Cox's letter to Mr. Jay seems to imply that you had communicated your idea that I might avail myself of it in the subject referred to me. But I think it justice to ask your express permission, and that you will be so good as to give me an answer by return of post. I am, Sir, your most obedient humble servant. TO BENJ. VAUGHAN. New York, June 27, 1790. Dear Sir,--Your favor of March 27th came duly to hand on the 12th instant, as did your very valuable present, the dry rice, brought from the Moluccas, by Lieut. Blight. I immediately sent a few seeds to Virginia, where I am in hopes there would still be force of summer sufficient to mature it. I reserve a little for next spring, besides sowing some in pots, from which I have now twenty-three young plants, just come up. I fear, however, there is not summer enough remaining here to ripen them, without the uncertain aid of a hot house. Upon your encouragement, I think I shall venture to write to Mr. Hinton Este, of Jamaica, on the subject. You will have known that we had lost Dr. Franklin before your letter came to hand; consequently, the relation of Lieut. Blight's adventure, which you were so kind as to send, rests with me.