Letter, from Richard Sheepshanks to Sir John Herschel, dated at 30 Woburn Place Autograph letter signed by sender. Needs the name of the print seller from whom John Frederick William Herschel's cousin bought the copy of the print of John Frederick William Herschel's portrait, so Richard Sheepshanks can learn how many copies are available. Richard Sheepshanks will then know whether to 'treat with [the printer] as an honest man or a rogue.' 2 March 1840