Charles Darwin autograph letter signed to his financial advisor, dated 12 July with no year, but docketed on blank page as 1854 by the recipient, Thomas Salt. At this time, Darwin was beginning to write ''On the Origin of Species'', which would be published in 1859. Darwin discusses several financial accounts in the letter, including a loan to a Mr. Muckleston, which had been intended for five years, but took nine to be repaid; Darwin writes ''I am thankful to have done with the gentleman.'' From his home in Down Farnborough Kent, Darwin writes in full, ''My dear Sir / I am much obliged to you for your note received this morning, informing me that 1018 [pounds] will be paid to my account this day in London. - I am very sorry that you shd. have been inconvenienced by Mr. Muckleston paying the whole in Gold. - I am thankful to have done with the gentleman. / I have not yet received the interest from L. Powis on the 13,000 [pounds] up to July 1st., but daresay I soon shall. - I do not suppose that an ordinary receipt for the principal & interest will suffice, & if it be my part to have any formal document drawn up will you be so kind to take the necessary steps. - I sent about a month ago the Bond to you. - I sent a provisional, stamped receipt for the 13,000 [pounds] to Mr. - C. Wilding. / My dear Sir / Your's very sincerely / C. Darwin''. Three page letter on bifolium stationery measures 9.75'' x 7.75'' unfolded. Small hole at center, folds and light wear, overall very good condition with a bold signature.