1. Arthur Waugh, “London Letter,” The Critic: A Weekly Review of Literature and the Arts 25, January 18, 1896, 44.
2. S. A. Pierce, “Queer Names of Newspapers,” letter to Christian Advocate 74, no. 49 (December 7, 1899), 1976.
3. David Starr Jordan, “The Sympsychograph: A Study in Impressionist Physics,” Popular Science Monthly 49 (September, 1896): 597–602.
4. David Starr Jordan, The Days of a Man, 1851–1899 (New York: World Book Company, 1905), 599.
5. Mary Jo Nye, “N-rays: An Episode in the History and Psychology of Science,” Historical Studies in the Physical Sciences, 11, no. 1 (1980): 127–156.