Again, in the case of the infant burning its finger, there appears to be something like a similar process, which we can trace much better than the child itself. The child puts its finger to the flame of the candle, and it feels pain; from which it learns, for the first time, that flame burns. This is the knowledge which it has acquired. But there is also an inference drawn from that knowledge, not by reasoning, but by the operation of the principle under consideration, an inference of which it is probable the child itself at the time is unconscious, but the existence of which is sufficiently proved by its uniform conduct afterwards. By the operation of this principle in the child's mind, before he can reason, he has inferred, that if he shall again touch flame, he will again feel pain. He will very probably forget the particular circumstance in which his finger was burned, but the inference then drawn,--the impression made upon the mind, and which corresponds to an inference,--still remains, and is made the chief instrument which Nature employs in this most important part of all her valuable educational processes. The child accordingly is found ever after, not only preserving the particular finger that was burned, but all its fingers and members, from a burning candle; and not from a candle only, but from fire and flame of every kind. This appears to be the natural order of that process of which we are here speaking; and before leaving it, there are two or three circumstances connected with it, that we ought not to omit noticing, more particularly, because the whole of them appear to hold out additional evidence of the little value which Nature attaches to knowledge for its own sake, and of her decided approval of its acquisition, only, or at least chiefly, when it is reduced to practice. The first of these circumstances is, that Nature, in all cases, teaches popularly--not philosophically; that is, she does not refuse to teach one part of a connected series of phenomena, because the whole is not yet perceived; nor does she neglect the use of the legitimate application of an ascertained truth, because the principle or law by which it acts remains as yet undiscovered. Her object evidently is, the attainment of the most _useful_ part of the knowledge presented to her pupil, and the _practical use_ of that part; leaving the investigation of the other parts to the will or convenience of the person afterwards. The infant accordingly made use of its knowledge, although it knew nothing about the nature of flame; and the man and the mariner would have done as they did, although they had known nothing at all about the science of meteorology.