1From Thomas Jefferson to Benjamin Vaughan, 29 December 1786 (Jefferson Papers)
When I had the honour of seeing you in London, you were so kind as to permit me to trouble you sometimes with my letters and particularly on the subject of Mathematical or philosophical instruments. Such a correspondence will be too agreeable to me, and at the same time too useful, not to avail myself of your permission. It has been an opinion pretty generally received among philosophers that...
2From Thomas Jefferson to Benjamin Vaughan, 23 July 1788 (Jefferson Papers)
Your favor of April 5. 1788. covering that also of Jan. 26.–87 did not miscarry; but I have been prevented answering it by a long journey through Holland and Germany, and by a necessary attention to some pressing matters in the first moments after my return. In fact, I was occupied on the subject of Hygrometers and preparing to write to you, when I received your favor of the 11th. inst. This...
3From Thomas Jefferson to Benjamin Vaughan, 11 March 1789 (Jefferson Papers)
Knowing how ready you are to interest yourself in whatever may promote the happiness of mankind I take the liberty of addressing you on a subject very interesting to a part of the United states. You know that the several species of rice cultivated in Piedmont, Egypt and Carolina require to be laid under water during a certain season of the year, and therefore occasion pestilential fevers which...
4From Thomas Jefferson to Benjamin Vaughan, 2 July 1787 (Jefferson Papers)
Your favor of Feb. 16. came to my hands in the moment I was setting out on a tour through the Southern parts of France and Northern of Italy, from which I am but just now returned. I avail myself of the earliest moment to acknolege it’s receipt and to thank you for the box of magnets which I find here. Tho I do not know certainly by or from whom they come, I presume they came by Colo. Smith...