or both of these causes it is probably owing, that some consider it still as an undecided question whether the student, when admitted to draw from the living model, should confine himself to drawing punctiliously what he sees before him, or exercise that judgment which his course in the Antique Academy has matured, and draw forms corresponding with each other. To me, after considering carefully what has been advanced on either side, it appears demonstrated, that the student is admitted to the life to avail himself of the knowledge he acquired from the previous study of classic forms. Here the office and the essential duties of the _visitor_, I speak with deference, begin, to confirm him where he is right, to check presumption, to lend him his own eyes, and, if it be necessary, to convince him by demonstration and example. But the human system cannot be comprehended by mere contemplation, or even the copy of the surface. The centre of its motion must be fixed, justly to mark the emanation of the rays. The uninterrupted undulation of outward forms, the waves of life, originate within, and, without being traced to that source, instruct less than confound. The real basis of sight is knowledge, and that knowledge is internal; for though, to speak with Milton, in Poetry gods and demigods, "vital in every part, all heart, all eye, all ear, as they please limb themselves, and colour, shape, and size assume as likes them best;" in Art their substance is built on the brittle strength of bones, they act by human elements, and to descend must rise: hence, though a deep and subtle knowledge of _anatomy_ be less necessary to the painter than to the physician or surgeon; though the visible be his sphere and determine his limits, a precise and accurate acquaintance with the skeleton, the basis of the machine, is indispensable; he must make himself master of the muscles, tendons, and ligaments that knit the bones or cover and surround them, their antagonismus of action and reaction, their issues, their insertions, and the variety of shapes which they assume, when according to their relative foreshortenings, laxity, position, they indicate energy or slackness of action or of frame, its greater or less elasticity, furnish the characters of the passions, and by their irritability in louder or fainter tones become the echoes of every impression.