JOY, Charles Arad, chemist, born in Ludlowville, Tompkins County, New York, 8 October, 1823. He was graduated at Union in 1844, and at the Harvard law school in 1847. During the same year he was appointed on the United States geological survey of the Lake Superior region, under Josiah D. Whitney and Charles T. Jackson. Subsequently he went to Europe and studied chemistry in Berlin, at Gottingen, where in 1852 he received the degree of doctor of philosophy, and at the Sorbonne in Paris. Soon after his return he was called to the chair of chemistry in Union college, and held it until 1857, when he was elected to a similar professorship in Columbia, remaining there till 1877. His original investigation began in Gottingen with researches on the combination of alcohol radicles with selealum, in which field he was one of the earliest workers. Later he examined the compounds of glucinum, and published an account of his investigations in the "American Journal of Science." He also made numerous analyses of minerals and meteorites. Of the former, many were contributed to Dana's "Mineralogy." Professor Joy was a member of the juries of the International world's fairs of London, Paris, Vienna, and Philadelphia, and also a member of scientific societies. In 1866 he was elected president of the Lyceum of natural history (now New York academy of sciences). He was also president of the American photographic society, chairman of the Polytechnic association of the American institute, and foreign secretary of the American geographical society. Professor Joy was a large contributor of popular articles on scientific subjects to various journals, and had held the editorship of the "Scientific American," and later of the "Journal of Applied Chemistry," also of the chemical articles in the "American Cyclopaedia." Failing health, the result of a sunstroke, that he received at the World's fair in Philadelphia during 1876, compelled his retirement, and he is now (1887) residing in Germany.