Letter, from Thomas Williams to Sir John Herschel, dated at Northumberland House Autograph letter signed by sender, with annotation by Sir John Herschel. Requested letters from [Hugh Percy] late Duke of Northumberland to John Frederick William Herschel offering to pay for publishing [Cape Results]. Hopes to include that debt in late Duke's estate, rather than as obligation upon [Algernon Percy] new Duke. Encloses receipt for £1,000. [John Frederick William Herschel note (20 Feb 1848): Sent receipt to TW. Expenses came within £50 of Duke's gift.] 18 February 1848