A sense of security is difficult of definition. Largely, it is founded upon habit and association. It is induced and maintained by familiar surroundings. On board ship, in a small world of our own, we seem to be contained by the boundaries of the bulwarks, to be sailing beyond the influences of the land and of other ships. The sea is the same we have known for so long. Every item of our ship fitment--the trim arrangement of the decks, the set and rake of mast and funnel, even the furnishings of our cabins--has the power of impressing a stable feeling of custom, normal ship life, safety. It requires an effort of thought to recall that in their homely presence we are endangered. Relating his experiences after having been mined and his ship sunk, a master confided that the point that impressed him most deeply was when he went to his room for the confidential papers and saw the cabin exactly in everyday aspect--his longshore clothes suspended from the hooks, his umbrella standing in a corner as he had placed it on coming aboard. Soldiers on service are denied this aid to assurance. Unlike us, they cannot carry their home with them to the battlefields. All their scenes and surroundings are novel; they may only draw a reliance and comfort from the familiar presence of their comrades. At sea in a ship there is a yet greater incitement to their disquiet. The movement, the limitless sea, the distance from the land, cannot be ignored. The atmosphere that is so familiar and comforting to us, is to many of them an environment of dread possibilities. It is with some small measure of this sense of security--tempered by our knowledge of enemy activity in these waters--we pace the bridge. Anxiety is not wholly absent. Some hours past, we saw small flotsam that may have come from the decks of a French mail steamer, torpedoed three days ago. The passing of the derelict fittings aroused some disquiet, but the steady routine of our progress and the constant friendly presence of familiar surroundings has effect in allaying immediate fears. The rounds of the bridge go on--the writing of the log, the tapping of the glass, the small measures that mark the passing of our sea-hours. Two days out from Marseilles--and all well! In another two days we should be approaching the Canal, and then--to be clear of 'submarine waters' for a term. Fine weather! A light wind and sea accompany us for the present, but the filmy glare of the sun, now low, and a backward movement of the glass foretells a break ere long. We are steaming at high speed to make the most of the smooth sea. Ahead, on each bow, our two escorting destroyers conform to the angles of our zigzag--spurring out and swerving with the peculiar "thrown-around" movement of their class. Look-out is alert and in numbers. Added to the watch of the ship's crew, military signalers are posted; the boats swung outboard have each a party of troops on guard.