The Big Trees Ranch at Felton, California, is bought by San Francisco businessman Joseph Warren Welch to preserve the giant redwoods (Sequoia sempervirens) from logging.[5]
English mathematician Rev. William Allen Whitworth publishes the first edition of his Choice and Chance: An Elementary Treatise on Permutations, Combinations, and Probability.
Stewart, Matthew (2003). Monturiol's Dream: The Extraordinary Story of the Submarine Inventor Who Wanted to Save the World. London: Profile Books. p.312. ISBN978-1-86197-470-9.
Arias, Ingrid (2006). Im Dienste der Volksgesundheit: Frauen – Gesundheitswesen – Nationalsozialismus[In the Service of Public Health: Women, Healthcare, Nazism] (in German). Vienna: Verlagshaus der Ärzte. p.87. ISBN978-3-90148-886-3.
Clifton J., Philips (1971). "Fearn, Anne Walter". In James, Edward T. (ed.). Notable American Women, 1607-1950: A Biographical Dictionary. Vol.1. p.603. ISBN978-0-67462-734-5.