Another inference, which we think may legitimately be drawn from the above examples, is this, that although Nature prompts the child silently to throw off or reject that which the mind at the time cannot receive, yet it would be better for the child if no more had been pressed upon him than he was capable of receiving. The very rejection of any portion of the mental food presented for acceptance, must in some measure tend to dissipate the mind, and exhaust its strength. This we think is demonstrated by the fact, that the child had to listen for _an hour_, and yet retained on his memory no more than experience shews us could have been much more successfully communicated in _five minutes_. This leads us to another remark, almost equally important; which is, that the want of classification among the children, will not only hurt them, but tend to waste the time, and unnecessarily to exhaust the strength of the teacher. The teacher's success with any one child, is not to be estimated by the pains he takes, or the extent of his labour, but by the amount of knowledge actually retained by the child. To employ an hour's labour, therefore, to communicate that knowledge which could with much better effect be given in five minutes, is both unreasonable and improper; and every one who will for a moment think on the subject must see, that a lesson, which in that short space of time conveyed the whole of the knowledge that the pupils had been able to pick up during the hour's exercise, would leave the teacher eleven-twelfths of his time to benefit the other classes. The nurseryman follows this plan with his trees, and with evident success, both in saving time, and room, and labour. When he sows his acorns, one square yard will contain more plants than will ultimately occupy an acre. It is only as they increase in growth, that they are thinned out and transplanted; and such should be the case in communicating knowledge to children. To attempt to teach the whole history at once, is like sowing the whole acre with acorns, and thinning them out during a quarter of a century. The loss of seed in this case is the least of the evils; for the ground would be robbed of its strength, nine-tenths of it would be rendered unnecessarily useless during a large portion of the time; and much of the anxiety, and care, and labour of the nurseryman would be thrown away. Ultimately he would find, that of the many thousands of oaks he had sowed, he had been able to rear no more _than the acre could carry_. By following out this principle in education, and giving the child as much as he can receive, and no more, of the whole series of truths to be communicated, his mind, at the close of the exercise, will be much more vigorous, the ideas received will be much better understood, more firmly rivetted upon the memory, and much more at the command of the will, while the quantity of knowledge really communicated, is at least equal in amount.--The only