VI. THE POSSIBILITY OF DEFEATING THE SUBMARINE 228 VII. THE SUBMARINE IN TIMES OF PEACE 259 VIII. THE DESTINY OF THE SUBMARINE 289 ILLUSTRATIONS DOUBLETONES PAGE Simon Lake _Frontispiece_ The Pigmy Conquerer of the Sea 2 Storage Battery Cell 14 A Submarine Cell Completely Assembled Ready for Installation 14 On Picket Duty 20 The Lower Portion of Galileo Periscope 22 The Voice and Ear of the Submarine 26 Torpedo Tubes Assembled Ready for Installation in a Submarine Boat 27 A Whitehead Torpedo 28 Rear End of the Whitehead Torpedo 29 Rapid-firing Guns 30 A Modern Submarine Cruiser, or Fleet Submarine (Lake Type) 32 The Launching of the "Protector" 62 The "Delphine" 66 The "Fenian Ram" 96 "Argonaut, Jr.," 1894 128 Sketch of the Confederate Submarine "Hunley" 150 The New Orleans Submarine 152 The "Intelligent Whale" 153 "Argonaut" as Originally Built. Launched in August, 1897 176 Submarine with Cushioned Bottom Wheels 178 The "Argonaut" after being Lengthened and Rebuilt, in 1898, Showing Ship-shaped, Watertight, Buoyant Superstructure 182 The "Holland" Running on the Surface 190 "Amphibious" Submarine 202 The "Protector" (Lake Type, 1901-1902) 210 Official Drawing of the Captured German Mine-planting Submarine, U C-5 214 A Bottom-Creeping Submarine Passing Through a Mine Field 216 A Mine and Net Evading Submarine Under-running a Net 217 Mines Placed Under Ships at Anchor 220 Submarine Supply Station 221 Submarine "Seal"--Lake Type U.S. 226 British Submarine B-1 (Holland type) 227 British Submarine C-2 Arriving at Portsmouth in a Gale 230