Sometimes they crossed the Toucques in a boat, and started to hunt for sea-shells. The outgoing tide exposed star-fish and sea-urchins, and the children tried to catch the flakes of foam which the wind blew away. The sleepy waves lapping the sand unfurled themselves along the shore that extended as far as the eye could see, but where land began, it was limited by the downs which separated it from the “Swamp,” a large meadow shaped like a hippodrome. When they went home that way, Trouville, on the slope of a hill below, grew larger and larger as they advanced, and, with all its houses of unequal height, seemed to spread out before them in a sort of giddy confusion. Two weeks later he said, “I’m getting my head in training for that match.”!

Girls and boys, the former on the right, the latter on the left-hand side of the church, filled the stalls of the choir; the priest stood beside the reading-desk; on one stained window of the side-aisle the Holy Ghost hovered over the Virgin; on another one, Mary knelt before the Child Jesus, and behind the altar, a wooden group represented Saint Michael felling the dragon. And now to the particular physics of surf-riding. Get out on a flat board, six feet long, two feet wide, and roughly oval in shape. Lie down upon it like a small boy on a coaster and paddle with your hands out to deep water, where the waves begin to crest. Lie out there quietly on the board. Sea after sea breaks before, behind, and under and over you, and rushes in to shore, leaving you behind. When a wave crests, it gets steeper. Imagine yourself, on your hoard, on the face of that steep slope. If it stood still, you would slide down just as a boy slides down a hill on his coaster. “But,” you object, “the wave doesn’t stand still.” Very true, but the water composing the wave stands still, and there you have the secret. If ever you start sliding down the face of that wave, you’ll keep on sliding and you’ll never reach the bottom. Please don’t laugh. The face of that wave may be only six feet, yet you can slide down it a quarter of a mile, or half a mile, and not reach the bottom. For, see, since a wave is only a communicated agitation or impetus, and since the water that composes a wave is changing every instant, new water is rising into the wave as fast as the wave travels. You slide down this new water, and yet remain in your old position on the wave, sliding down the still newer water that is rising and forming the wave. You slide precisely as fast as the wave travels. If it travels fifteen miles an hour, you slide fifteen miles an hour. Between you and shore stretches a quarter of mile of water. As the wave travels, this water obligingly heaps itself into the wave, gravity does the rest, and down you go, sliding the whole length of it. If you still cherish the notion, while sliding, that the water is moving with you, thrust your arms into it and attempt to paddle; you will find that you have to be remarkably quick to get a stroke, for that water is dropping astern just as fast as you are rushing ahead.

And now for another phase of the physics of surf-riding. All rules have their exceptions. It is true that the water in a wave does not travel forward. But there is what may be called the send of the sea. The water in the overtoppling crest does move forward, as you will speedily realize if you are slapped in the face by it, or if you are caught under it and are pounded by one mighty blow down under the surface panting and gasping for half a minute. The water in the top of a wave rests upon the water in the bottom of the wave. But when the bottom of the wave strikes the land, it stops, while the top goes on. It no longer has the bottom of the wave to hold it up. Where was solid water beneath it, is now air, and for the first time it feels the grip of gravity, and down it falls, at the same time being torn asunder from the lagging bottom of the wave and flung forward. And it is because of this that riding a surf-board is something more than a mere placid sliding down a hill. In truth, one is caught up and hurled shoreward as by some Titan’s hand. The years passed, and, one sunny morning, the Snark poked her nose into a narrow opening in a reef that smoked with the crashing impact of the trade-wind swell, and beat slowly up Papeete harbour. Coming off to us was a boat, flying a yellow flag. We knew it contained the port doctor. But quite a distance off, in its wake, was a tiny out rigger canoe that puzzled us. It was flying a red flag. I studied it through the glasses, fearing that it marked some hidden danger to navigation, some recent wreck or some buoy or beacon that had been swept away. Then the doctor came on board. After he had examined the state of our health and been assured that we had no live rats hidden away in the Snark, I asked him the meaning of the red flag. “Oh, that is Darling,” was the answer. The Snark is a sail-boat. She was built primarily to sail. But incidentally, as an auxiliary, a seventy-horse-power engine was installed. This is a good, strong engine. I ought to know. I paid for it to come out all the way from New York City. Then, on deck, above the engine, is a windlass. It is a magnificent affair. It weighs several hundred pounds and takes up no end of deck-room. You see, it is ridiculous to hoist up anchor by hand-power when there is a seventy-horse-power engine on board. So we installed the windlass, transmitting power to it from the engine by means of a gear and castings specially made in a San Francisco foundry.