1. George Henry Lewes's 1869 Diary and Journal: A Transcription and Annotation of Unpublished Holographs Held at the Beineke Library of Yale University
2. On the Action of Sonorous Vibrations in Varying the Force of an Electric Current;Hughes;Proceedings of the Royal Society,1878
3. Kinetic Theory of the Dissipation of Energy;Nature,1874
4. Shadows of the Coming Race 1
5. Stray, Julian , “The Beginnings of the Pneumatic Railway,” London Postal Museum, www.postalmuseum.org/blog/the-beginnings-of-the-pneumatic-railway/. See also “The Pneumatic Railway at Sydenham,” Times, August 29, 1864, 5.