Oil tankers, serious loss of, Oliver, Vice-Admiral Sir Henry, and mining operations, becomes D.C.N.S., his valuable work, Ommanney, Admiral R.N., an appreciation of his services, Operations Division of Naval Staff strengthened, Ordnance production, delay in, Ostend, bombardment of, Otranto, hydrophone station at, Otranto, Straits of, a drifter patrol attacked by Austrian light cruisers, mining the, "Otter" mine destroyers, Outward-bound convoys, losses in, Overseas trade, vessels sunk in 1917, "P" Boats, fitted with "fish" hydrophones, hunting flotillas of, _P. Fannon_, Page, Mr. W.H., relations with author, Paget, Admiral Sir Alfred, Paine, Commodore Godfrey, joins the Air Council, Palestine, work of the Navy off coast of, Paravanes, and their use, _Pargust_ (decoy ship), _Partridge_, sinking of, Patrol craft and minesweeping services, a tribute to officers and men of, as decoy vessels, hydrophones for, lack of British, retired officers volunteer for work in, synopsis of losses among, Patrol gunboats, Pease, Mr. A.F., _Pellew_, damaged in action, Persius, Captain, and the construction of German submarines, Personnel of the Navy, importance of, Piave, the, Austrian advance to, Pirie, Lord, becomes Controller-General of Merchant Shipbuilding, Pitcher, Petty-Officer Ernest, awarded V.C., Plymouth convoy, the, losses in 1917, Pola, Germans destroy their submarines at, Portland, submarine-hunting flotillas at, Ports of assembly for Atlantic convoy system, Portsmouth, gunnery courses for cadets and apprentices at, instructional anti-submarine school at, Pound, Captain A.D.P., Preston, Captain Lionel G., Head of Minesweeping Service, Pretyman, Right Hon. E.G., _Prince Charles_, success of, against an enemy submarine, Pringle, Captain, appointed Chief of Staff to Sir Lewis Bayly, _Prize_ sinks a submarine, Production of warships, etc., and forecasts of _et seq._, Projectiles, anti-submarine, "Protected sailings," system of, Q-Boats (_see_ Decoy ships), Q22 in action with a submarine, Queenstown, amicable relations between British and U.S. Navies at, Queenstown convoy, the, Ramsgate, bombardment of, Rawlinson, General Sir Henry (Lord), confers with Admiral Bacon, Red Sea, naval operations in, Rodman, Rear-Admiral Hugh, Route orders, and principle on which compiled, Royal Naval Air Service, the, activities of, bombs enemy bases, Royal Naval Air Service, the, in the Eastern theatre of war, Russian Baltic Fleet, the, demobilization of, Russian Navy, the defection of, Russo-Japanese war, the, Ryan, Captain, experimental work of,