American chemist and geologist, born in North Stratford (now Trumbull), Connecticut; graduated at Yale, and was called to the bar in 1802, but in the same year threw up law for science; became professor of Chemistry at Yale, a position he held for 50 years (till 1853); did much to stimulate the study of chemistry and geology by lectures throughout the States; founded (1818) the American Journal of Science, and was for 28 years its editor; during 1853-55 was lecturer on Geology at Yale; his writings include "Journals of Travels in England, Holland, and Scotland" (1779-1864). Benjamin Silliman, son of preceding, also an active scientist along his father's lines; founded the Yale School of Science, and filled the chairs of Chemistry at Louisville (1849-1854) and at Yale (till 1869); was co-editor of the Journal of Science (1845-85), and wrote various popular text-books of chemistry and physics (1816-1885).