Napier, John, 4. Napoleon, 27, 32, 33. _Narval_, 91. _Nautilus_, Fulton’s, 27 to 31, 56, 72. _Nautilus_, Jules Verne’s, 59. Navigating bridge, 103, 111. _Nebraskan_, 195. Nemo, Captain, 59. _New Ironsides_, 36, 144. _New York_, 78. Nordenfeldt, 28, 61, 74, 95. _Nordenfeldt II_, 62, 78, 83. Notes, American, 180, 195 to 197, 200, 203. Austrian, 204. British, 181. German, 191, 199. _No. 6_, 124, 128. Oars, 6, 9, 16, 17, 66. _Ocean_, 154. Oil-engine, 60, 78, 104. _Olympic_, 162, 178. _Orduna_, 198. _Osage_, 115. Oxygen, 7, 131. _Ozark_, 100. Panlow, Captain Archibald, 187. Panoramas, 26. Payne, Lieutenant, 39. Pendulum, 49, 53. _Peral_, 64, 66. “Peripatetic Coffin,” 39. _Persia_, 205. Persius, Captain, 183. Periscope, 78, 83, 114, 125, 186. _Petropavlosk_, 147. Philip, Captain, 146. Phosphorescence, 6, 19. Pipe-masts, 86, 95. Pitt, 32. _Plongeur_, 57, 132. _Plunger_, 75. _Pluton_, 203. _Pluviôse_, 124, 125, 134. Pneumatic gun, 79. _Pommern_, 163. “Porpoise dive,” 78, 160. Porter, Admiral David, 40. “Primer,” the, 46. Propellers, adjustable, 82. primitive, 16, 28. transverse, 83. vertical-acting, 16, 28, 61, 83, 95 154. _Protector_, 95. Pumps, 16, 28, 111. _Ramillies_, 35. Ramming, 124, 168, 200. Reducing-valve, 48. Rescuing, 125, 156. _Resurgam_, 61. Riou, Olivier, 59. Rogers, Commodore, 34. _Rotterdam Boat_, 9, 14, 69. _Royal Edward_, 166. Rudders, bow, 96, 111. horizontal (see diving-planes). _S-126_, 169. _San Francisco_, 149. Safety-buoy, 132. catch, 47. helmets, 130. jackets, 130. Sails, 29, 31. Salvage docks, 134. Sampson, Admiral, 89, 146. Schneider, Commander, 201. Scope, Lieutenant Perry, 100. Searchlight, 86, 186. Selfridge, Rear-admiral, 115. Servo-motor, 49, 53. Sirius, Captain John, 177, 187, 189, 206. Skerrett, Mr. R. G., 135. _Spuyten Duyvil_, 42. Stahl, Gustav, 196. “Staple of News, the,” 3. Steam submarine, 61. Steamboat, 32, 34. Storage-batteries, 59, 126, 184. “Striker,” the, 46. _Stromboli_, 42. Submarine fighting submarine, 174. Submarine railroad, 64. Submersible, 91. Superstructure, 90, 102. Symons’s submarine, 9. Taylor, D. W., Chief Constructor, U. S. N., 96. Telephoning from submarines, 88, 132. _Tecumseh_, 142. Templo, Alvary, 71. _Texas_, 146. Thrasher, Leon C., 190. Tinkling Cloud, 195. Tissot, Professor, 171.