High Quality Content by WIKIPEDIA articles! Giovanni Francisco Vigani (c. 1650 – 1712), known also as John Francis, was an Italian chemist who became the first professor of chemistry in the University of Cambridge. The treatise Medulla Chymiae was originally of 19 pages. It was considerably enlarged, and editions appeared in 1683, 1685, 1693, and 1718–19. As the author explains, it was intended to record his own experiments and improvements in the preparation of certain compounds. Vigani was commended by Georg Ernst Stahl for his practical skill and avoidance of speculation unsupported by experiment. He rather avoided theoretical discussions, referring those who felt interested in them to Robert Boyle, while he himself pursued practical investigation. Among other things, Vigani devised a method for purifying iron sulphate from copper; for making ammonium sulphate; and for proving that to form a given salt a metallic base takes always the same amount of acid.

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