1Robert Walsh to Thomas Jefferson, 21 October 1817 (Jefferson Papers)
When I mentioned to you the Dissertation of Professor Playfair on the progress of Mathematical and Physical Science, you expressed, I think, a wish to have the work. I therefore take the liberty of Sending it to you, and have no doubt but that it will give you particular pleasure, inasmuch as you have a strong relish for Mathematical Studies. In examining an invoice of Books Sent Me from...
2Robert Walsh to Thomas Jefferson, 27 January 1818 (Jefferson Papers)
I thank you sincerely for the letter with which you have honoured me. I did not intend that the Dissertation of Playfair Should be returned, as I possessed another copy; but I am heartily glad, at all events, that I have been the means of contributing to your amusement. The Professor himself would attach no Small importance to the opinion which you have pronounced on his work, and I rejoice in...
3Robert Walsh to Thomas Jefferson, 12 March 1818 (Jefferson Papers)
Your acceptable letter of the 19 th Ulto : and the tract of M r Tracy were received in due season. Owing to the attention which I found myself impelled by curiosity to give to the debates of Congress and the arguments of the Supreme Court , I did not find get leisure to Cast my eye over the work of Tracy , until yesterday.
4Robert Walsh to Thomas Jefferson, 20 April 1818 (Jefferson Papers)
As there is now no likelihood of the resurrection of the American Register, & as I am about to return with my family to Philadelphia , I think it proper to restore to you at once the valuable manuscript of M r de Tracy . It certainly deserves to be well translated, & published among us; but I doubt the sale would defray the expence of printing. The taste for Such profound speculations is...