Correspondence of John Frederick William Herschel: volume 26 letters related to specific topics Incoming and outgoing orrespondence relating to: British Association for the Advancement of Science: HS/26/1 to HS/26/24 The Telescope Glass Committee: HS/26/25 to HS/26/47 The Talbot v. Henderson dispute of patent: HS/26/48 to HS/26/60 The Royal Society and Board of Trade: HS/26/61 to HS/26/72 Draft, original letters and copy letters in Herschel's hand Typed index for the volume preceding the letters 1823-1854