LORADO TAFT, well-known American Sculptor and Author. W. J. HENDERSON, Music Critic of the New York Sun, and Author of many books. STEPHEN BONSAL, Author and War Correspondent. E. H. FORBUSH, State Ornithologist of Massachusetts, and Author of many books. BURGES JOHNSON, Professor, Vassar College, Author and Humorist. ARTHUR HOEBER, Artist, Critic and Author. DANIEL C. BEARD, Author, Artist, and celebrated Naturalist. SAMUEL ISHAM, distinguished Art Critic and Author. H. ADDINGTON BRUCE, Author of many books. PROF. C. R. RICHARDS, Director of Cooper Union, New York City. ROBERT M. McELROY, Professor of American History, Princeton University. CLARENCE WARD, Professor of Architecture, Rutgers College. IDA M. TARBELL, well-known Magazine Writer and Author of many books. HENRY T. FINCK, Music Editor of the New York Evening Post, and Author of various books. J. T. WILLING, Art Editor and Author. GEORGE W. BOTSFORD, Professor of Ancient History, Columbia University. H. E. KREHBIEL, Music Critic of the New York Tribune, and Author of various books. F. J. MATHER, Jr., Professor of Art and Archeology, Princeton University. FREDERICK PALMER, Celebrated War Correspondent, and Author of various books. HENRY WOODHOUSE, Editor of "Flying," and an authority on aeronautics. WILLIAM A. COFFIN, N. A., well-known Artist and Author. KENYON COX, N. A., distinguished Artist, Author and Instructor in art. ESTHER SINGLETON, Author of many books. WALTER PRICHARD EATON, well-known Magazine Writer and Author of various books. JOHN K. MUMFORD, Author and Expert on rugs. BELMORE H. BROWNE, Artist, Author and Explorer. FRANK WEITENKAMPF, of the New York Public Library, Expert In Prints. W. J. HOLLAND, Director of the Carnegie Museum, Pittsburgh, Pa., and distinguished Naturalist. DEAN C. WORCESTER, noted Traveler and Lecturer and Author. AYMAR EMBURY, well-known Architect and Writer on architectural subjects. C. F. TALMAN, of the United States Weather Bureau, Washington. Complete Your MENTOR LIBRARY SUBSCRIPTIONS ALWAYS BEGIN WITH THE CURRENT ISSUE The following numbers of The Mentor Course, already issued, will be sent postpaid at the rate of fifteen cents each. Serial No.