Text: "The mathematics of vibratory etheric science, both pure and applied, require long and arduous research. It seems to me that no man's life is sufficient, with the most intense applications, to cover more than the introductory branch. The theory of elliptic functions, the calculus of probabilities, are but as pygmies in comparison to a science which requires the utmost tension of the human mind to grasp." (Keely)

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