Fishing for submarines, 170, 183. _Foca_, 124. Folger, Commander, 82. Forman, Justus Miles, 194. _Formidable_, 162, 169. Frohman, Charles, 194. _Fulton_, 135. Fulton, Robert, 26 to 35, 69, 139, 186. Gages, 20, 112, 129. Garett, Rev. Mr., 61. Gasoline engines, 86, 105. Gasoline fumes, 90, 107, 125. German contributions, 107, 115. Gimlets, 16, 18, 64. Goubet submarines, 60. Grant, Charles, 205. Greased leather, 6, 9. Greil, Dr. Cecile L., 202. _Giuseppe Garibaldi_, 169. _Gulflight_, 191. Guns, 83, 102, 174, 187, 202. Guncotton, 46. _Gustave Zédé_, 59. _Gymnote_, 59. Gyroscope, 50, 53, 114. Gyroscopic compass, 113. Hague Tribunal, 148, 200. Halstead, 56. Hammond, Jr., Mr. John Hays, 55. Hanson, Captain, 183. Harsdoffer, 5, 6. _Hatsuse_, 147. Hautefeullie, Abbé de, 7. _Hela_, 155. _Hermes_, 161, 168. _Hesperian_, 199, 202, 206. _Hogue_, 160, 169. Holbrook, Commander, 165. Holland, John P., 68 to 81, 95, 104, 115, 175. _Holland_, 76 to 81, 86, 103, 104, 125. _Holland No. 1_, 70. _Holland No. 2_, 71. _Holland No. 8_, 76. Holland Torpedo-boat Company, 75, 79, 81. “Horn of the Nautilus,” 29. _Housatonic_, 40. Howard, Ensign, 36. Hovgaard, Commander, 75. _Huascar_, 50. Hubbard, Elbert, 194. _Hundley_, 38 to 41. Hydroplanes, 84, 95. Hydrostatic valve, 48, 128, 154. _Intelligent Whale_, 56, 81, 86. International law, 178, 179, 200. _Irresistible_, 154, 161. James I, 5. “Jammer,” the, 46. Jefferson, Thomas, 14, 16, 22, 25. Jonson, Ben, 3, 64. _K_-class, 138. _Kambala_, 124. _Kearsarge_, 78. _Kheyr-el-din_, 165. Klein, Charles, 194. Krupps, the, 99. Labeuf, Monsieur, 91. Lacavalerier, Señor, 66. Lacomme, Dr., 64. Lake, Mr. Simon, 82 to 99, 175. Laurenti, Major Cesare, 134. Laurenti dock, 134. Le Son, 9. Lee, Ezra, 15 to 22. _Leelanlaw_, 198. _Leon Gambetta_, 169. Leveling-vanes, 96. Lifeboats, 131. List, Carl Frank, 187, 191. Lord St. Vincent, Admiral, 32. Lupuis, Captain, 44. _Lusitania_, 181, 192 to 198. _Lutin_, 124. McNeely, Robert, 206. _Maine_, 76. _Majestic_, 166. Makaroff, Admiral, 147. Malone, Mr. Dudley Field, 196. _Marblehead_, 146. _Maryland_, 137. _Merrimac_, 69. Mersenne, 6, 91. _Messudieh_, 165. Microphones, 171. Mines, Confederate, 143, 154, note. contact, 139, 144, 148 to 155, 179. drifting, 23, 139, 154. electric, 89, 144, 151. observation, 144. Mine-field, 151, 165. Mine-planter, 146, 149. Mine-sweeping, 139, 152. _Moltke_, 164. _Monitor_, 42, 69, 81. Mother-ship, 100, 111, 135. _Mute_, 35.