Pedagogy, properly speaking, is a branch of rhetoric, namely, the art of teaching, and only concerns the teacher; but the word is often extended to the art of learning, a branch, or fruit, of logic, which is usually and properly taught to pupils in schools. This art will form no part of the subject of this book; but it is pertinent to the question just put to remark that the power of discriminative attention, the power of well-coordinated exertion, and the power of readily acquiring habits, can all three be enormously strengthened by well-planned exercises steadily persisted in.