With our children, the study of words and abstractions alone may, in its degree, produce the same results. Nature-studies have long been valued as a "means of grace," because they arouse the enthusiasm, the love of work which belongs to open-eyed youth. The child _blase_ with moral precepts and irregular conjugations turns with delight to the unrolling of ferns and the song of birds. There is a moral training in clearness and tangibility. An occult impulse to vice is hidden in all vagueness and in all teachings meant to be heard but not to be understood. Nature is never obscure, never occult, never esoteric. She must be questioned in earnest, else she will not reply. But to every serious question she returns a serious answer. "Simple, natural, and true" should make the impression of simplicity and truth. Truth and virtue are but opposite sides of the same shield. As leaves pass over into flowers, and flowers into fruit, so are wisdom, virtue, and happiness inseparably related. [1] Read before the National Educational Association at Buffalo, New York, 1896. THE HIGHER SACRIFICE.[1] Each man that lives is, in part, a slave, because he is a living being. This belongs to the definition of life itself. Each creature must bend its back to the lash of its environment. We imagine life without conditions--life free from the pressure of insensate things outside us or within. But such life is the dream of the philosopher. We have never known it. The records of the life we know are full of concessions to such pressure. The vegetative part of life, that part which finds its expression in physical growth, and sustenance, and death, must always be slavery. The old primal hunger of the protoplasm rules over it all. Each of the myriad cells of which man is made must be fed and cared for. The perennial hunger of these cells he must stifle. This hunger began when life began. It will cease only when life ceases. It will last till the water of the sea is drained, the great lights are put out, and the useless earth is hung up empty in the archives of the universe. This old hunger the individual man must each day meet and satisfy. He must do this for himself; else, in the long run, it will not be done. If others help feed him, he must feed others in return. This return is not charity nor sacrifice; it is simply exchange of work. It is the division of labor in servitude. Directly or indirectly, each must pay his debt of life. There are a few, as the world goes, who in luxury or pauperism have this debt paid for them by others. But there are not many of these fugitive slaves. The number will never be great; for the lineage of idleness is never long nor strong.