THERE comes a moment when without warning boy and puppy instantaneously pass into the consciousness of manhood. With the young canine it comes with the first deep-throated defiance of the intruder, the instinct that the wriggling, fawning days are over and that the moment to attack and accept attack has arrived. With the human puppy the change is more elusive. To some it comes with the first clinging splendor of long trousers, to others with the first hopeless love, when at the tragic age of fifteen the world, fate and the disparity of ages intervene. But usually this transformation, all in the twinkling of an eye, from the hungry slouch of boyhood into the stern and brooding adolescence, comes with the discovery of a controlling idea. Without any apparent cause, some illuminating purpose