Now this law ought to be applied with the utmost strictness to the art of teaching. For if teaching be really an art,--that is, a successive combination of means,--it should undoubtedly be a combination of means to some specific end. Nothing can be more obvious, than that a man who sits down to work, should know what he intends to do, and how he is to do it. Such a line of conduct should be imperatively demanded of the teacher, both on account of the importance of his work, and of the immense value of the material upon which he is to operate. The end he has in view, whatever that end may be, ought to be correctly defined before he begins; and no exercise should upon any account be prescribed or demanded from his pupils, which does not directly, or indirectly at least, conduce to its attainment. To do otherwise is both injudicious and unjust. For if the operations of the husbandman during spring have to be selected and curtailed with the strictest attention to time and the seasons, how carefully ought the energies and the time of youth to be economized, when they have but one short spring time afforded them, during which they are to sow the seed which shall produce good or evil fruit for eternity? As to what this great end which the teacher ought steadily to contemplate should be, we shall afterwards enquire; at present we are desirous only of establishing this general law in the art of teaching, that there should be an end accurately defined, and constantly kept in view; and for the attainment of which every exercise prescribed in the school should assist. The teacher who does otherwise is travelling in the dark, and compelling labour for labour's sake;--like the manufacturer who would keep all his machinery in motion, not to make cloth, but to appear to be busy. 2. Another law adopted in the successful prosecution of the arts is, _to use the best known means for attaining any particular end_.--This law is well known in all the other arts, and success invariably depends upon its adoption. The fields are not now tilled by the hoe, nor is cotton spun by the hand. These modes of operating have no doubt the recommendation of antiquity; but here antiquity is always at a discount, and no one doubts the propriety of its being so. The arts are advancing; and they who would impede their progress on the plea of not departing from the usages of antiquity, would be pitied or laughed at.