With respect to the eclipse of September 17. I know of no observations made in this State but my own, although I had no doubt that others had observed it. I used myself an equatorial telescope, and was aided by a friend who happened to be with me, and observed through an achromatic telescope of Dollard's. Two others attended the time-pieces. I had a perfect observation of the passage of the sun over the meridian, and the eclipse commencing but a few minutes after, left little room for error in our time. This little was corrected by the known rate of going of the clock. But we as good as lost the first appulse by a want of sufficiently early attention to be at our places, and composed. I have no confidence, therefore, by several seconds, in the time noted. The last oscillation of the two luminaries was better observed. Yet even there was a certain term of uncertainty as to the precise moment at which the indenture on the limb of the sun entirely vanished. It is therefore the forming of the annulus, and its breaking, which alone possess my entire and complete confidence. I am certain there was not an error of an instant of time in the observation of either of them. Their result therefore should not be suffered to be affected by either of the others. The four observations were as follows: The 1st. appulse, 0h. 13´ 54´´ Annulus formed, 1h. 53´ 0´´} central time of } central time of the Annulus broken, 1h. 59´25´´} annulus } two contacts Last oscillation, 3h. 29´ 2´´ 1h. 56´12½´´ 1h. 51´28´´ Latitude of Monticello, 38° 8´ I have thus given you, Sir, my observations, with a candid statement of their imperfections. If they can be of any use to Mr. Bowditch, it will be more than was in view when they were made; and should I hear of any other observations made in this State, I shall not fail to procure and send him a copy of them. Be so good as to present me affectionately to your much-esteemed father, and to accept the tender of my respect. TO MELATIAH NASH. MONTICELLO, November 15, 1811.