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Seybert, Henry (23 December 1801–03 March 1883), scientist and philanthropist, was born in Philadelphia, Pennsylvania, the son of Adam Seybert, a scientist, apothecary, and politician, and Maria Sarah Pepper. Seybert studied chemistry, geology, and mineralogy at the École des Mines in Paris from 1819 to 1821; his scientific education was paid for by his father who had, at an earlier period, been one of Philadelphia’s most prominent scientists, a member of the Chemical Society of Philadelphia and the American Philosophical Society, and a candidate for the chair of chemistry at the University of Pennsylvania. After returning to Philadelphia, Seybert began a series of chemical analyses of minerals and thus transmitted to the United States this method of classification (as opposed to the classification of minerals by external characteristics or by crystal structure)....