He joined Sir Thomas Bernard in agitating (1817) against salt duties, which were repealed in 1825. In 1820 he was prominent, as a chemical expert, in a notable case between Messrs. Severn, King, & Co. and some insurance offices. He was a numismatist, and made a collection of Greek and Roman coins; he was a collector also of prints and autographs, and brought together a set of the works of Joseph Priestley. He was elected a Foreign Honorary Member of the American Academy of Arts and Sciences in 1823.