Ballast-tanks, 16, 38, 57, 82, 111, 138. _Baralong_ case, 164, note. Barber, Lieutenant F. M., 16. Barlow, Joel, 26, 34. Bates, Jr., Lindon, 194. “Battle of the Kegs,” 23. Bauer, Wilhelm, 56, 65, 120, note. Beatty, Admiral, 175. Beauregard, General, 39. _Belridge_, 148. _Berwick Castle_, 124. Bigskorth, Squadron Commander, 172. _Birmingham_, 159. Blake, Mr., 10. Blockade, 177 _et seq._ “Blowing the tanks,” 63, 112, 122, 128. Booms, 92, 171. Borelli, 10. Boucher’s submarine, 66. Bourgois, Captain, 57. Bourne, William, 4. Boush, Rear-Admiral, 137. _Bouvet_, 154. Boyle, Robert, 7. British Hollands, 80. British Navy, 30, 70, 72, 175, 178. Brun, Monsieur, 57. _Bulwark_, 161. Buoyancy chamber, 49. Bushnell, David, 6, 13 to 25, 28, 95, 128, 154. _C-11_, 124. _C-14_, 124. Cable-cutting, 89, 95. _Cairo_, 144. Caldwell, Lieutenant H. C., 78, 79. _Caprivi_, 148. Carlson, Captain, 40. _Cerberus_, 22. Chandler, Mr. Edward F., 53. Chlorin gas, 126, 129, 137. _Clairmont_, 34, 81. _Commodore Jones_, 144. Compass, 18, 113. Compensation-tank, 79, 118. Compressed-air tank, 30, 57, 131. Conning-tower, 12, 15, 28, 78, 103, 113. Constantin’s submarine, 66. Cooking, 108. Copper sheathing, 18, 35. _Cressy_, 160, 169. Crilley, Frank, 137. Cushing, Lieutenant, 43, 166. _D-5_, 155. Daniels, Secretary, 81, 138. Dardanelles, the, 64, 147, 154, 165. _David_, 36, 43, 61. Davis, Commander, 52. Day, J., 10, 128. Delaying-valve, 47. _Demologos_, 35. Depth-control, 113. Destroyers, 35, 104, 168, 170. _Delfin_, 124. Dewey, Admiral, 79, 145. _Diable Marin_, 65, 120, note. Diesel, Dr., 108. Diesel engines, 104, 135, 184. Divers, 14, 40, 56, 136. Diving-bells, 4. Diving compartment, 83, 88, 94, 130, 132. Diving-planes, 28, 38, 48, 71, 72, 78, 111. Dixon, Lieutenant, 40. _Dorothea_, 32. Doughty, Thomas, 115. Doyle, Sir Arthur Conan, 178, 186. Drzewiecki, 64, 71. _Dunsely_, 198. Dubilier, Mr. W., 171. _E-4_, 160. _E-5_, 124. _E-9_, 156. _E-11_, 165. _E-13_, 164. _E-15_, 165. _Eagle_, 12, 18. Edison battery, 126. Eel-boats, 4, 14. Electric Boat Company, 81, 96. Electric motors, 108, 184. Electric submarines, 59, 60, 66, 83, note. _Emerald Isle_, 72. Emergency drop-keel, 10, 15, 83, 128. Enver Pasha, 166. Ericsson, John, 82, 104. Escape from sunken submarine, 130. Even-keel submergence, 61, 96. _F-4_, 124, 136. _Falaba_, 189. Faotomu, Lieutenant Takuma, 128. _Farfadet_, 124. Farragut, Admiral, 142. Fenian Brotherhood, 71. _Fenian Ram_, 73. Fessenden oscillator, 119, 125.