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Sir Edward, an English chemist; born in Church town, England, in 1825; studied chemistry in the Museum of Practical Geology and in Germany under Bunsen. He made the spar of the union of organic radicles with metals, announcing in 1850 the preparation of compounds of zinc with methyl and ethyl. From this he deduced the conclusion that an atom of the metal could only attach itself to a definite number of the atoms of other elements, which discovery Ied to the theory ef “ equivalents.” He was appointed Profe or of Chemistry at Owens Seite.