The Editor desires to acknowledge his indebtedness to the following distinguished educators, scientists, writers and publicists for helpful suggestions, counsel, contributions, or revisions connected with the various departments of THE CIRCLE OF KNOWLEDGE.
President University of Virginia; Editor-in-Chief _Library of Southern Literature_; author of _Obligations and Opportunities of Citizenship_, etc.
Educator and Historian; author of _Institutes of General History_, _History of the United States_, etc.
Late President University of Michigan; author of _The Higher Education_, _Progress in International Law_, etc.
Cornell University; author of _Plant Breeding_, _Manual of Gardening_, _Cyclopedia of American Horticulture_, etc.
University of Pennsylvania; author of _Text-book of Chemistry_, _Text-book of Physics_, etc.
Late President Oberlin College; author of _Christian Evidences_, _Lectures_, etc.
University of Nebraska; author of _Essentials of Botany_, _Botany for High Schools and Colleges_, _Elementary Botany_, etc.
University of Kansas; author of _The Story of Human Progress_, _Outlines of Sociology_, etc.
Jurist, Publicist; Associate Justice U. S. Supreme Court; author of _American Citizenship_, _The Twentieth Century_, etc.
President N. Y. University; former U. S. Commissioner of Education; author of _The Making of our Middle Schools_, _Origin of American State Universities_, etc.
Late editor New York _Christian Advocate_; author of _Travels in Three Continents_, _The Land of the Czar_, etc.
Columbia University; author of _The Civil War and the Constitution_, _Political Science and Comparative Constitutional Law_, etc.
Colorado School of Mines; Geologist for Colorado Geological Survey; author of _A Pocket Handbook of Minerals_, etc.
Editor _Popular Science Monthly_; author of _School and Society_, _American Men of Science_, etc.
President Notre Dame University; author of _Priests of Holy Cross_, etc.
Harvard University; author of _History of United States_, _English History for American Readers_, etc.
Department of Psychology and Literature, Buffalo State Normal School; author of _Talks to Teachers_, _Outlines of Literature_, etc.
Former Secretary Kansas Department of Agriculture; author of _Swine Husbandry_, _Alfalfa_, _The Farmer’s Encyclopedia_, etc.