THE EDITED BY J. McKEEN CATTELL VOLUME XII. NEW YORK 1921 THE EARTH SCIENCES AS THE BACKGROUND OF HISTORY. Dr. John RE-SHAPING OUR FOREST POLICY. Professor J. W. Toumey---- CONTROLLING THE AIRPLANE AT TWENTY THOUSAND FEET. Professor SURVEYS OF THE INTESTINAL PROTOZOA OF MAN IN HEALTH AND DISEASE. Dr. R. W. Hegner and Dr. George C. Payne------- ------- ON THE CHARACTER OF PRIMITIVE HUMAN PROGRESS. Professor R. ----------- 53 SELECTION—AN UNNOTICED FUNCTION OF EDUCATION. Professor W. THE GROUP-THEORY ELEMENT OF THE HISTORY OF MATHEMATICS. Professor G. A. Miller---------- THE OLDEST OF THE FORESTS. Dr. John M. Clarke----- Selections for an American Valhalla; The Thompson Medal for Geology and Palenotology; The Engineering Foundation; Scientific Items----- -------- 93 Application made for transfer of office of entry to Utica, N. Y., as second-class matter. |