Note 98 — Chapter V · EVOLUTION OF THE PRINCIPAL CONCEPTS.
Frances A. (Frances Alice) Welby translation
For a summary of these investigations, see the chapter “Sensations of Orientation” in Prof. E. Mach’s Popular Scientific Lectures, 3rd ed., Chicago, 1898; and for original discussions of the whole subject of space-sensations, see the same author’s Analysis of the Sensations, Chicago, 1897.—Trans.