Autograph Letter Signed ‘William Huggins’, suggesting Mr. Lewis Day as a suitable candidate “for your long course of lectures”, knowing that “he has a large number of art photographs suitable for projection on a screen”. 3 pp. 7 x 4 inches, a few minor blemishes only, traces of former mounting on blank verso. 90 Upper Tulse Hill, 3 May 1893. Sir William Huggins (1824-1910), English astronomer best known for his pioneering work in astronomical spectroscopy together with his wife Margaret Lindsay Huggins. Huggins built a private observatory at 90 Upper Tulse Hill, London, from where he and his wife carried out extensive observations of the spectral emission lines and absorption lines of various celestial objects. Huggins was elected a Fellow of the Royal Society in June 1865, was awarded their Royal Medal (1866), Rumford Medal (1880) and Copley Medal (1898) and delivered their Bakerian Lecture in 1885. He then served as President of the Royal Society from 1900 to 1905.