WARREN, Samuel Edward, educator, born in West Newton, Massachusetts, 29 October, 1831. He was graduated at the Rensselaer polytechnic institute in 1851, where, during the same year, he became assistant in charge of descriptive geometry and drawing. In 1854 he was appointed professor, and remained until 1872, when he accepted a similar chair in the Massachusetts institute of technology. In 1875 he resigned the latter post, and also that of lecturer in the Massachusetts normal art-school, which he had held from 1872. He then devoted his attention to the revision of his series of textbooks and to conducting a school of private instruction in Newton, Massachusetts, his present residence. Professor Warren made an exhibit of his works and of drawings by his pupils, illustrating their use, at the World's fair in Philadelphia in 1876, which was complimented in the official reports, and a similar one at the fair in Paris in 1878, for which he received a diploma. He is a member of various scientific and educational societies, and, in addition to numerous contributions on educational subjects to current reviews and periodicals, he has published a series of text-books, including "General Problems from the Orthographic Projections of Descriptive Geometry" (New York, 1860) ; "Students', Draftsmen's, and Artisans' Manual" (1861; afterward issued as "Elementary Projection Drawing," 1867) ; "Elementary Linear Perspective" (1863) ; "Drafting Instruments and Operations" (1865)" "Elementary Plane Problems" (1867) ; "General Problems of Shades and Shadows" (1867) ; "General Problems in the Linear Perspective of Form, Shadow, and Reflection" (1868); "Elements of Machine Construction and Drawing" (2 vols., 1870) ; "Elementary Free-hand Geometrical Drawing" (1873) ; "Elements of Descriptive Geometry : Part, I., Surfaces of Revolution," afterward issued as "Problems, Theorems, and Examples in Descriptive Geometry" (1874);" Problems in Stone-Cut-ting" (1875) ; "Elements of Descriptive Geometry, Shadows and Perspective" (1877); "Elements of Plane and Solid Free-hand Geometrical Drawing" (1878); and "A Primary Geometry" 0887).