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transmutation of metals. Philosophical foundation for the belief in alchemy. Alchemistic theory of the nature of metals. Origin of the conception of the Philosopher’s Stone. Geber. Association of alchemy with astrology. Rhazes. Avicenna. Chemical processes and substances known to the Arabian chemists. The Western Alchemists. Albertus Magnus. Roger Bacon. Raymond Lully. Arnoldus Villanovanus. Johannes de Rupecissa. George Ripley. Basil Valentine.

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