Though we have described the hand as the great and main organ of touch, let it be understood that it is not the first called into operation. The hand requires rigid discipline; for a long period it is useless as an organ of tact; yet, when educated, how perfect, how precise! But it is made what it is by education. Our ideas coincide exactly with those of sir Charles Bell, who thus writes: "The lips and the tongue are first exercised; the next motion is to put the hand to the mouth in order to suck it; and no sooner are the fingers capable of grasping, than whatever they hold is carried to the mouth; so that the sensibility to touch in the lips and tongue, and their motions, are the first inlets to knowledge, and the use of the hand is a later acquirement." Another passage from the same gifted writer is as follows: "The first office of the hand, then, is to exercise the sensibility of the mouth; and the infant as certainly questions the reality of things by that test, as the dog does by its acute sense of smelling. In the infant, the sense of the lips and tongue is resigned only in favour of the sense of vision, when that sense has improved, and offers a greater gratification, and a better means of judging of the qualities of bodies. The hand very slowly acquires the sense of touch; and many ineffectual efforts are seen in the arms and fingers of the child, before the direction of objects or their distance is ascertained. Gradually the length of the arm, and the extent of its motions, become the measure of distance, of form, of relation, and perhaps of time." Throughout life, the sensibility, as it regards tact, of the tongue and lips continues paramount; we can feel the slenderest hair with our tongue, which our hands would not appreciate: but, on the contrary, size, form, distance, order, and the general qualities of matter, can only be gained through the hand, after a persevering discipline. A blind man may examine a statue with his hands, and pronounce upon its excellence; and this fact suggests to us an idea of sir Charles Bell, who says: "The knowledge of external bodies, as distinguished from ourselves, cannot be acquired until the organs of touch in the hand have become familiar with our own limbs. We cannot be supposed capable of exploring anything by the motion of the hand, or of judging of the form or tangible qualities of an object pressed against the skin, before we have a knowledge of our own body as distinguished from things external to us." From these remarks we naturally slide into a dissertation on a sense, allied to that of touch, but yet different--we mean muscular sense.