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Researches on magnetism, electricity, heat, light, crystallization, and chemical attraction : in their relations to the vital force / By Karl, Baron von Reichenbach. Tr. and ed. at the express desire of the author, with a preface, notes, and appendix, by William Gregory. With three plates and twenty-three wood-cuts. Parts I and II, including the second edition of the first part, cor. and improved. Public Domain Mark. Source: Wellcome Collection.