 In 1692 he was invited to write a treatise on chemistry, which was never completed.By this time he had become an acknowledged teacher of the subject in Cambridge, and, though still independent of university support, had acquired a reputation.In 1703 the Senate of the University of Cambridge passed a resolution "investing with the title of professor of chemistry John Francis Vigani, a native of Verona, who had taught chemistry with reputation in Cambridge for twenty years previously."