BY the death of Prof. Simon Newcomb science has sustained one of the most severe blows of recent years. America has lost her most eminent man of science, and not since the death of Adams has the world been deprived of so illustrious an investigator in theoretical astronomy. Newcomb's career up to 1899 was described by Loewy in the article on “Scientific Worthies” in NATURE, vol. lx., p. 1, and his activity and marvellous powers of work continued up to the date of the, illness that has just terminated fatally. Since 1899 he has given us his interesting book entitled “The Reminiscences of an Astronomer” (1903), in which he described the early incidents of his life and related the extraordinary circumstances by which his steps were guided into the career which led him to such eminence.