Sir William smoked in silence. His thin, aristocratic face, and his level grey eyes, had a look of fatigue. "I was particularly glad to avail myself of your invitation," he said. "I wanted practical experience of the conditions in the North Sea--weather and visibility. And, later on, in the North Atlantic. I'm going over to Ireland next month." His tired eyes followed the blue smoke curling upwards. "Of course, the experiments we tried down South answered all right for short distances. That's what rather deceived us. They were harbour trials, no more. We want something more exhaustive than that. And, as you say, there's the pull of the tides to consider.... Confound the tide!" His companion smiled. "That's what Canute said. Or words to that effect. But it didn't help matters much." "Quite," replied Sir William dryly. "Well, I should like to take a patrol boat and one of our submarines for a day or two and test that new theory--to-morrow if I may. And--while I think of it--I have promised a young nephew of mine to dine with him to-night in his ship, if it in no way inconveniences you?" The other nodded, and, reaching out his hand, pressed the button of an electric bell beside his desk. * * * * * It was the hour preceding dinner, and the majority of the members of the Wardroom had congregated in the ante-room to discuss sherry and the day's affairs before descending to their cabins to change. It was a cheerful gathering, as the hour and the place betokened, and the usual mild chaff flowed to and fro in its mysteriously appointed channels. In Naval communities, as in most others where men are segregated from wider intercourse by a common mode of life and purpose, each one occupies the place designed for him by Destiny for the smooth working of the whole. These types are peculiar to no trade or profession. A gathering of farmers or elders of the Church, or even Christy Minstrels, would, if thrown together for a sufficient period of time, and utterly dependent on one another for daily intercourse, fall into the places allotted to each by temperament and heredity. Each little community would own a wit and a butt; the sentimentalist and the cynic. The churl by nature would appear through some veneer of manner, if only to bring into relief the finer qualities of his fellows; lastly, and most surely, one other would jingle a merciful cap and bells, and mingle motley with the rest.