Letter, from Hugh Percy (3rd Duke of Northumberland) to Sir John Herschel, dated at Syon Autograph letter signed by sender. Accepts John Frederick William Herschel's suggestion about using the offered money for publication costs [see John Frederick William Herschel's 1835-6-12]; is concerned about the telescope at Cambridge, as G. B. Airy has left for Greenwich; final comments on the comet's effects and the weather. 3 September 1835