For some time during the early years of childhood Nature is the chief, or the only Teacher; and the contrast between her success at that time, and the success of the parent or teacher who succeeds her, is very remarkable, and deserves consideration. When we examine this process in the case of infants, we see Nature acting without interference, and therefore with undeviating success. Within a few months after the child has attained some degree of consciousness, we find that Nature, under every disadvantage of body and mind, has succeeded in communicating to the infant an amount of knowledge, which, when examined in detail appears very wonderful.--The child has been taught to know his relations and friends; he has acquired the ability to use his limbs, and muscles, and organs, and the knowledge how to do so in a hundred different ways. He has become familiar with the form, the colour, the texture, and the names of hundreds of articles of dress, of furniture, of food, and of amusement, not only without fatigue, but in the exercise of the purest delight, and with increasing energy. He has begun to contrast objects, and to compare them; and this capacity he evinces by an undeviating accuracy in choosing those things which please him, and in rejecting those things which he dislikes. But above all, the infant, along with all this substantial knowledge, has been taught to understand a language, and even to speak it. The fact of all this having been accomplished by a child of only two or three years of age, is so common, that the mysterious principles which it involves, are too generally overlooked. We thoughtlessly allow them to escape observation, as if they were mere matters of instinct, and were to be ranked with the spider's catching its prey, or the sparrow's building its nest. But the principles which regulate these different operations are perfectly dissimilar. In the case of the spider and the sparrow there is no teaching, and, of course, no learning. Their first web, and their first nest, are as perfect as the last; but in the case of the infant, with only two or three exceptions, there is nothing that he does, and nothing that he knows, which he has not really learned,--acquired by experience under the tuition of Nature, by the actual use of his own mental and physical powers.