Here then we have the highway of education, marked off, and walled in by Nature herself. That these four great departments in her educational process will be much better defined, and their parts better understood, when experience has given more ample opportunities for their observation, cannot be doubted; and it is not improbable, that future investigations will suggest a different arrangement of heads, and a different modification of their parts also; but still, the great outline of the whole, we think, is so distinctly marked, that, so far as they go, there can be little mistake; and by following them, we are most likely to obtain a large amount of those benefits which education is intended to secure.--To excel Nature is impossible; but by endeavouring to imitate her, we may at least approach nearer to her perfections. It is not enough, however, for us to perceive the great outlines of Nature's operations in education; we must endeavour to follow her into the details, and investigate the means which she employs for carrying them into practical effect. We shall therefore take up the several departments above enumerated in their order, and endeavour to trace the laws which regulate her operations in each, for the purpose of assisting the teacher in his attempts to imitate them. CHAP. II. _On the Method employed by Nature for cultivating the Powers of the Mind._ The _first_ step in Nature's educational process, is the cultivation of the powers of the mind; and, without entering into the recesses of metaphysics, we would here only recall to the recollection of the reader, that the mind, so far as we yet know, can be cultivated in no other way than by voluntary exercise:--not by mere sensation, or perception, nor by the involuntary flow of thought which is ever passing through the mind; but by the active mental operation called "thinking,"--the voluntary exertion of the powers of the mind upon the idea presented to it, and which we have denominated "reiteration,"[1] as perhaps best descriptive of that thinking of the presented idea "over again," by which alone, as we shall see, the mind is cultivated, and knowledge increased.