There was but one thing to be done and that was to reach the land and return to a life more strictly earthly and more comfortable. There is nothing like water for overcoming a young man's fancy for many things. Ab swam now with a somewhat tired and languid stroke to the shore, where Oak awaited him hilariously. They almost came to blows that afternoon, and blows between such as they might have easily meant sudden death. But they were not rivals yet and there was much to talk of good-naturedly, after some slight outflamings of passion on the part of Ab, and the two men were good friends again. The sum of all the day was that there had been much exercise and fun, for Oak at least. Ab had not caught the Shell girl, manfully as he had striven. Had he caught her and talked with her upon the river bank it might have changed the current of his life. With a man so young and sturdy and so full of life the laughing fancy of a moment might have changed into a stronger feeling and the swimming girl might have become a woman of the cave people, one not quite so equal by heritage to the task of breeding good climbing and running and fighting and progressive beings as some girl of the hills. It matters little what might have happened had the outcome of the day's effort been the reverse of what it was. This is but the account of the race and what the sequel was when Ab swam so far and furiously and well. It was his first flirtation. It was yet to come to him that he should be really in love in the cave man's way. CHAPTER XV. THE MAMMOTH AT BAY. It was late autumn, and a light snow covered the ground, when one day a cave man, panting for breath, came running down the river bank and paused at the cave of One-Ear. He had news, great news! He told his story hurriedly, and then was taken into the cave and given meat, while Ab, seizing his weapons, fled downward further still toward the great kitchen-midden of the Shell People. Just as ages and ages later, not far from the same region, some Scottish runner carried the fiery cross, Ab ran exultingly with the news it was his to bring. There must be an immediate gathering, not only of the cave men, but of the Shell People as well, and great mutual effort for great gain. The mammoths were near the point of the upland!