Contents: The Nature of Matter; The Hydrogen, Spike, Dumb-bell, Tetrahedron, Cube, Octahedron, Bars, and Star Groups; Compounds; Catalysis, Crystallization; Conclusion; Analysis of the Structure of the Elements; Table of Atomic Weights; Notes and Reports of Certain of the Investigations; Index; Illustrated.

1912. Delivered in the Dome, Brighton, on 30th June, 1911.

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An in-depth study of theosophical teachings.