Letter, from Thomas Young to Sir John Herschel, dated at 48 Welbeck St. Autograph letter signed by sender. Ask Charles Babbage to send tables of logarithms to Thomas Young, who will compare them to [Brook] Taylor's. Bets that five errors will be found. Did John Frederick William Herschel order mountain barometer from [J. F.] Newman? Will inquire about [W. E.] Parry's instruments. Admiralty, not us, should order sextants. 5 November 1825