WILLIAM MARTIN AIKEN, F. A. I. A., _Former United States Supervising Architect, Treasury Department, Washington, D. C._ PROGRESS OF THE CENTURY IN ARCHITECTURE. HARVEY W. WILEY, M. D., PH. D., LL. D., _Chief Chemist of Division of Chemistry, Agricultural Department, Washington, D. C._ THE CENTURY’S PROGRESS IN CHEMISTRY. RITER FITZGERALD, A. M., _Dramatic Critic “City Item,” Philadelphia_. THE CENTURY’S MUSIC AND DRAMA. JAMES P. BOYD, A. M., L. B., THE CENTURY’S LITERATURE. MORRIS JASTROW, JR., PH. D., _Professor of Semitic Languages, University of Pennsylvania_. THE RECORDS OF THE PAST. MAJOR HENRY E. ALVORD, C. E., LL. D., _Chief of Dairy Division, United States Department of Agriculture, Washington, D. C._ PROGRESS IN DAIRY FARMING. SARA Y. STEVENSON, Sc. D., _Secretary of Department of Archæology and Paleontology, University of Pennsylvania_. THE CENTURY’S MORAL PROGRESS. CHARLES McINTIRE, A. M., M. D., _Lecturer on Sanitary Science, Lafayette College, Easton, Pa._ PROGRESS OF SANITARY SCIENCE. LIEUTENANT-COLONEL ARTHUR L. WAGNER, _Assistant Adjutant General United States Army_. THE CENTURY’S ARMIES AND ARMS. WALDO F. BROWN, _Agricultural Editor “Cincinnati Gazette.”_ THE CENTURY’S PROGRESS IN AGRICULTURE. WALTER LORING WEBB, C. E., _Assistant Professor of Civil Engineering, University of Pennsylvania_. PROGRESS IN CIVIL ENGINEERING. D. E. SALMON, M. D., _Chief of Bureau of Animal Industry, Agricultural Department, Washington, D. C._ THE CENTURY’S PROGRESS IN THE ANIMAL WORLD. MAJOR-GENERAL JOSEPH WHEELER, _United States Army, and Member of Congress from Eighth Alabama District_. LEADING WARS OF THE CENTURY. GEORGE J. HAGAR, _Editor of Appendix to Encyclopædia Britannica_. THE CENTURY’S FAIRS AND EXPOSITIONS. HON. BRADFORD RHODES, _Editor of “Banker’s Magazine.”_ THE CENTURY’S PROGRESS IN COINAGE, CURRENCY, AND BANKING. H. E. VAN DEMAN, _Late Professor of Botany and Practical Horticulture, Kansas State Agricultural College_. THE CENTURY’S PROGRESS IN FRUIT CULTURE.