Lancaster August 18th. 1806.
I have accompanied this with a copy of my observations on the eclipse of the sun on the 16th. of June last, as communicated to my correspondent, one of the Secretaries of the National Institute, and member of the Legion of honour. To which I have added, a copy of a letter to Mr. Patterson, being a supplement to a preceeding letter to the Philosophical Society:—the supplement contains the observations of Mr. Dunbar as made on the same eclipse near Natchez, with the result as made out by myself.—
If this eclipse was observed at Williamsburgh by Mr. Madison, I shall be gratified in obtaining his observations, in order to ascertain as nearly as possible, the difference between the meridians of the several places where the eclipse was observed by persons provided with proper instruments.—
I have lately received some very valuable, and interesting works from the National Institute; particularly the new improved lunar, and solar tables,—accompanied by a splendid, and truly elegant dedication to Bonaparte.—
I should have written to you more frequently, but have been deterred, from a consciousness of your time being more valuably employed, than in attending to any thing in my power to communicate.
With the greatest respect and esteem, yours sincerely
DLC: Papers of Thomas Jefferson.