When the jerk came, Archie, suspecting nothing, was standing upright on the bow thwart, and at once, like a stone from a catapult, he went flying head-first through the air, striking the water with a loud splash, and disappearing into its dark embrace. [Illustration: "LIKE A STONE FROM A CATAPULT, ARCHIE STRUCK THE WATER WITH A LOUD SPLASH."] Hugh’s first impulse was to burst out laughing, for he knew Archie could swim like a seal; and when, a moment later, his head appeared above the water, he hailed him gaily: "Well done, Arch! That was splendid! Come back and try it again, won’t you?" while the twins laughed and crowed over their brother’s amusing performance. Archie was not disposed to take a serious view of the matter either, and shouted back, "Try it yourself. Come along; I’ll wait for you." When, however, he sought to regain the boat, he found the current too strong for him, and despite his utmost exertions, could make little or no headway against it. This would not have been a cause for much alarm, however, had not the banks of the run been lined with a dense growth of huge rushes through which Samson himself could hardly have effected a passage, while at their edge the water ran deep and swift. Moreover, it still had plenty of the winter chill in it, for the time was mid-spring. Beginning to feel a good deal frightened, Archie called out, "You’ll have to come and help me, Hugh. I can’t get back to you." Now unquestionably the proper thing for Hugh to have done was to take up the anchor, and letting the boat drift down to where Archie was, haul him on board. But strange to say, cool, cautious Hugh for once lost his head. His brother’s pale, frightened face startled him, and without pausing to think, he threw off his coat and boots and leaped into the water, where a few strenuous strokes brought him to his brother’s side. The twins, in guileless innocence of any danger, thought all this great sport. Here were their two elder brothers having a swim without first taking off their clothes. They had never seen anything quite so funny before. They kneeled upon the stern-sheets, and leaned over the gunwale, and clapped their hands in childish ecstasy over what seemed to them so intensely diverting.