I. AN INTRODUCTORY VIEW:—Antiquity of Engineering—Ancient Roads and Bridges—Nineteenth Century Advances. II. BRIDGES:—Primitive Bridges—Iron and Steel Bridges—The Brooklyn Bridge—Niagara Suspension Bridge—Pecos River Viaduct—The Forth Bridge— Remarkable Arches—Stone Bridges. III. CAISSONS:—Invention of the Caisson—Its Principle and Use—Caisson Adventures. IV. CANALS:—The First Suez Canal—Nicaragua and Panama Canals —Modern Suez Canal—The Manchester Canal—Chicago Drainage Canal—What it is for. V. GEODESY:—Ancient Methods of Earth Measurements—The Century’s Advance in Methods of Measurement. VI. RAILROADS:—Their Invention and Development—Immense Value. VII. TUNNELS:—Ancient Origin of—Tunnels of Egypt, Babylonia, and India—Roman Tunnels—Of the Modern Tunnel—Advance in Machinery and Constructive Processes—Mount Cenis Tunnel—Tunnel Surveying and Excavating—The Hoosac Tunnel—St. Gothard Tunnel —St. Clair Tunnel—Its Construction and Commercial Effects 339–360 THE CENTURY’S PROGRESS IN THE ANIMAL WORLD I. OF ANIMAL DISEASES:—Effect of Napoleonic Wars—Various Animal Diseases—How controlled. II. INCREASE IN NUMBER OF ANIMALS:—Showing in Europe, United States, and Other Countries. III. IMPROVEMENT OF BREEDS:—Shortening the Time of Growth— Development of Dairy and Beef Breeds—Improvement in Wool Growing —Poultry Breeds—Thoroughbred Horses—The American Trotter— Animal Exports—Foreign Animal Imports—Displacement of Horses by Mechanical Motors—Prices of Animal Products—American Command of World’s Animal Markets 361–374 LEADING WARS OF THE CENTURY