No child will hesitate in answering such a question, not even Émile, unless I have taken great care that he shall not know how. Any child will say that the stone falls because it is heavy. "And what does heavy mean?" "Whatever falls is heavy." Here my little philosopher is really at a stand. Whether this first lesson in experimental physics aids him in understanding that subject or not, it will always be a practical lesson. Nothing to be Taken upon Authority. Learning from the Pupil's own Necessities. As the child's understanding matures, other important considerations demand that we choose his occupations with more care. As soon as he understands himself and all that relates to him well enough and broadly enough to discern what is to his advantage and what is becoming in him, he can appreciate the difference between work and play, and to regard the one solely as relaxation from the other. Objects really useful may then be included among his studies, and he will pay more attention to them than if amusement alone were concerned. The ever-present law of necessity early teaches us to do what we dislike, to escape evils we should dislike even more. Such is the use of foresight from which, judicious or injudicious, springs all the wisdom or all the unhappiness of mankind. We all long for happiness, but to acquire it we ought first to know what it is. To the natural man it is as simple as his mode of life; it means health, liberty, and the necessaries of life, and freedom from suffering. The happiness of man as a moral being is another thing, foreign to the present question. I cannot too often repeat that only objects purely physical can interest children, especially those who have not had their vanity aroused and their nature corrupted by the poison of opinion. When they provide beforehand for their own wants, their understanding is somewhat developed, and they are beginning to learn the value of time. We ought then by all means to accustom and to direct them to its employment to useful ends, these being such as are useful at their age and readily understood by them. The subject of moral order and the usages of society should not yet be presented, because children are not in a condition to understand such things. To force their attention upon things which, as we vaguely tell them, will be for their good, when they do not know what this good means, is foolish. It is no less foolish to assure them that such things will benefit them when grown; for they take no interest in this supposed benefit, which they cannot understand.