Isaac Barrow (1734). “The Usefulness of Mathematical Learning Explained and Demonstrated: Being Mathematical Lectures Read in the Publick Schools at the University of Cambridge”, p.28

Francis Bacon, Basil Montagu (1821). “A critique of Bacon's "Novum Organum," by Basil Montagu, extracted from the Retrospective Review, 1821. Few MS. notes”, p.285