This sketch of the life and activities of Sir Henry Enfield Roscoe is based, to a large extent, upon an obituary notice prepared at the request of the Councils of the Royal and Chemical Societies, of which its subject was a distinguished member, with a view to publication in their respective Proceedings and Transactions. In its present more extended form it is offered to a wider public as the record of “a life in civic action worn,” and as a slight tribute from a grateful pupil, an attached co-worker, and a lifelong friend to the memory of a strenuous high-minded man, of large aims and generous impulses, who spent his abilities and energies unstintingly in promoting the welfare of science and the good of his kind.