A highly distinguished chemist and natural philosopher, born at Newington Butts, near London, of poor parents; received a meagre education, and at 13 was apprenticed to a bookseller, but devoted his evenings to chemical and electrical studies, and became a student under Sir H. Davy, who, quick to detect his ability, installed him as his assistant; in 1827 he succeeded Davy as lecturer at the Royal Institution, and became professor of Chemistry in 1833; was pensioned in 1835, and in 1858 was allotted a residence in Hampton Court; in chemistry he made many notable discoveries, e. g. the liquefaction of chlorine, while in electricity and magnetism his achievements cover the entire field of these sciences, and are of the first importance (1791-1867).