'Tis past dispute, that the same Fault, is more clearly seen in the Works of other Men, than in our own; This furnishes us with an Argument in favour of Perspective, and renders it necessary for the young Painter to qualify himself therein, at his first setting out: His next Business will be to get a perfect Acquaintance with the Proportions of a Human Body. He may then proceed to make himself a Master of Architecture; so much of it, at least, as regards the Form and Regularity of the Out-sides of Buildings; And, whenever, in his future Practice, he finds Occasion, for things in which he has had no great Experience, let him not fail to observe Nature, and to Design them from the Life. When he is at Work, it may be of Ser vice, to have a plain Mirrour by him; wherein he may frequently survey his Piece, which will be there represented backwards, and will appear as if it were the Work of some other Hand; for by this Means he will be the better enabled to distinguish its Faults. And, Lastly, He will find his Account in laying down the Pencil, and retiring frequently to take a little Diversion. For the Mind, at his Return, will be more free, and the Judgment, more clear, and penetrating; whereas, a too assiduous Poring, jades the Mind, and rebates its Edge; insomuch, that he will then, not only be liable to commit the grossest Blunders, but, which is worse, to overlook them, and to let them escape impune.