'Correspondence Book of the Academy of Physics, Edinburgh', number 15., 21 April 1798-6 December 1799., MS.756. 'Correspondence Book of the Academy of Physics, Edinburgh': two volumes, numbered 14 and 15, containing copies of letters from February 1798 to December 1799, in the autograph of Henry Brougham, Francis Horner, and William Erskine, the Orientalist, as Secretaries., MSS.755-756. National Library of Scotland Archives and Manuscripts Division. https://nlssb.as.atlas-sys.com/repositories/2/archival_objects/47755 Accessed September 24, 2024.