But there are here other considerations of immense importance which must not be overlooked, and it is to these that any rational treatment of the subject must turn its main attention. Besides laying the foundation of trouble at this time, in a neglect of proper physical education for thirteen years back, we have also taken pains to lay it in too great an attention to mental education for exactly the same number of years. It must not be forgotten that the little girl, as she looks out for the first time through her intelligence-lighted eyes, by taking notice of anything, while she lies in her mother's arms, looks out upon a vast and complicated world of civilization, of which she is entirely ignorant, and that, from the very fact that she is "the heir of all the ages," she has to make acquaintance with her inheritance. To the baby, the light, all sounds, its cradle, the room, its own moving fingers, its mother's face, are vast regions of unexplored knowledge. There is absolutely nothing, however small, which is common or customary, and, as she grows older, to the three year old child even, a walk down one of our avenues, or the examination of a bureau drawer, is as exciting as a journey in a fairy palace. In fact, the whole world around her is merely one vast fairy palace, in which miracles are continually occurring, quite as astonishing and exciting as the appearance of the Genies at the rubbing of the wonderful lamp. And her world grows every day fuller and wider and more enchanting, just as the hazy cloud of the milky way unfolds and reveals itself to us under more and more powerful telescopes into star-dust, into myriads of distinct shining points, into stars and suns; and, under the telescopes of reasoning science, into worlds separated by distances so great, that "the imagination sinks exhausted," and very properly. Now, if any one will recall the sensation with which she first looked through a powerful telescope at this sight, she will then understand the state in which the brain of the little girl lives, as a continual atmosphere, and she will have no need to ask herself whether it is needful or allowable to add much cause for activity to that brain, for, at least, the first seven years of its life.