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The Evolution of Sound: A Part of [The Problem of Human Life], Containing a Review of Tyndall, Helmholtz, and Mayer
Manly P. Hall
The Evolution of Sound: A Part of [The Problem of Human Life], Containing a Review of Tyndall, Helmholtz, and Mayer
Source verified · September 2026
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About Manly P. Hall
Manly Palmer Hall was a Canadian-born occultist, lecturer, and prolific author whose work helped popularize comparative esotericism in the twentieth century. His best-known book, The Secret Teachings of All Ages (1928), surveyed symbols, myths, mysticism, and initiatory traditions from a wide range of cultures.
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