The first point of analogy to which we would advert, is the vigour and activity of the mental appetite in the young, which corresponds so strikingly with the frequent and urgent craving of their bodily appetite for food.--The desire of food for the body, and the desire of knowledge for the mind, are alike restless and insatiable in childhood; and a similar amount of satisfaction and pleasure is the consequence, whenever these desires are prudently gratified. That the desire for knowledge in the young is often weakened, and sometimes destroyed, is but too true; but this is the work of man, not of Nature. It will accordingly be found on investigation, with but few exceptions, that wherever the general appetite of the child, either for mental or bodily food, becomes languid or weak, it is either the effect for disease or of some grievous abuse. Another point of analogy consists, in the necessity of the personal active co-operation of the child himself in receiving and digesting his food.--There is no such thing in Nature as a child being fed and nourished by proxy. His food must be received, digested, and assimilated by his own powers, and by the use of his own organs, else he will never be fed. In the same way, the food for his mind can benefit him only in so far as he himself is the active agent. He must himself receive, reiterate in his own mind, and commit to the keeping of his memory, every idea presented to him by his teacher. No one can do this for him;--he must do it himself. In a family, the parent may provide, dress, and communicate the food to the child,--but he can do no more; and similar is the case with respect to the mental food provided by the teacher. He may no doubt select the most appropriate kinds,--he may simplify it,--he may break it down into morsels;--but his pupils, if they are to learn, must learn for themselves. When a pupil, to save himself trouble, tries to evade the learning of a preliminary lesson, or when the teacher winks at the evasion by performing the exercise for him, it is as absurd as for a parent to eat the child's food, and expect at the same time that his boy is to be nourished by it. If the mental food be too strong for the child, something more simple must be provided for him; but to continue to administer knowledge which the pupil does not comprehend, and force the strong mental food of an adult upon the tender capacities of a child, is an error of the most mischievous kind. It prevents the mind from acting at all, without which there can be no improvement. The mind must wield its own weapons if ignorance is to be dislodged; and if the child is to advance at all, he must overcome the difficulties that lie in his way by the exertion of his own powers. His teacher may no doubt direct him as to the best and the easiest way of accomplishing his object; but that is all. The pupil must in every case perform the exercise for himself.