Flournoy, Theodore. From India to the Planet Mars: A Study of a Case of Somnambulism. Daniel B. Vermilye, trans. New York: Harper and Bros. Publishers, 1900. Available from Scribd.
Today From India to the Planet Mars is discussed as an example of multiple personality who spoke in imaginary languages. Flournoy was a professor of psychology at the University of Geneva. His interest was medical. While Helene Smith was considered a psychic in her day, modern readers generally discount the mysticism and have regarded the work as a case study in multiple personality.
A modern interpretation of the work can be seen in
Eugene Taylorâ€™s â€œFrom India to the Planet Mars: A Multiple Personality with Imaginary Languagesâ€.