_St. Louis_ mined outside Liverpool, Salonika, Navy co-operation with Army in, Sanders, Lieutenant W. E., actions with submarines, awarded the V.C., memorial to, Scandinavian convoy, the, enemy attacks on a, loose station-keeping of ships in, losses in 1917, Scapa, a conference at, Scarlett, Wing-Captain F.R., Scheer, Admiral, his work on the High Sea Fleet, on the convoy system, Schellendorff, von, on German Army Staffs, Schwab, Mr., Sea, the, considerations on future safeguarding of, Seaplane, advent of "America" type of, Seaplane carriers, Seaplane stations, Searchlights, _Shannon_, Shipbuilding Advisory Committee, Shipbuilding programme of 1916, British, Shipping (British, Allied and neutral), losses in 1917, Shipping Controller, appointment of a, Sierra Leone convoy, the, Signalling arrangements for convoys, instruction in, Simpson, Rear-Admiral C.H., Sims, Vice-Admiral W.S., arrives in London, ensures unity of command, his career, hoists his flag at Queenstown, in command of U.S. forces in European waters, Singer, Admiral Morgan, Smoke screens, Spanish-American War, the, Special service or decoy ships, Specialist training in the Navy, Speed, importance of, in convoy system, Star shells, introduction of, Startin, Admiral Sir James, the Albert Medal for, _Staunch_ sunk by submarine, _Slonecrop_ (decoy ship) sinks a submarine, _Strongbow_, sinking of, Submarine attacks on decoy ships, campaign of 1917, the, danger, the, difficulties of combating, detector, an electrical, -hunting flotillas, warfare, offensive and defensive measures against, Submarines, British, delay in deliveries of, estimated number of enemy sinkings by, fitted as minelayers, length of time taken in construction of, offensive use of, operations against enemy submarines, production of, value of depth charges against, Submarines, German, aircraft attacks on, Allied losses by, 1916-17, as minelayers, devices for circumventing, losses of, Submarines, German, rapid construction of, success of, in the Mediterranean, _Swift_, action with German destroyers, Sydney (Cape Breton) convoy, the, Syrian Coast, the, operations on, Taussig, Lieut-Commander T.K., "Taut wire" gear, value of the device, _Terror_, bombardment of Ostend by, damaged, Thames Estuary, mines laid in the, Torpedo and Mining Department, the valuable work of, Torpedo, the, in general use, Tothill, Rear-Admiral H.H.D., Trade Division of the Naval Staff, the, "Trawler Reserve," the, Trawlers as minesweepers, convoy work of, delay in deliveries of, hunting flotilla work of, Troop transports, escorts for, Tyrwhitt, Rear-Admiral Sir Reginald, and his command,