In the practical part, again, the drawing-book can give us no real assistance in regard to color. And thus the efficacy of it is reduced to the communication of methods of drawing in white and black. This Chapman's book does to the best purpose possible under the circumstances, in what is technically termed the right-line system of drawing,--that is, the reduction of all forms to their approximate geometrical figures in order to facilitate the measurements of the eye. Thus, it is easier by far to determine the proportion which exists between the sides of a triangle formed by the lines connecting the three principal points in any figure than any curvilinear connections whatever. The application of the rectilinear system consists in the use, as a basis of the drawing, of such a series of triangles as shall at once show the exact relation of the points of definition or expression to each other; but the successful application of this depends much on the assistance of the trained eye and hand of a master watching every step we make. When we leave this section of the "American Drawing-Book," we leave all that is of practical value to the young artist. The prescription of any particular mode of execution is always injurious, (if in any degree effective,) for the reason that the student must not think of execution at all, but simply what the form is which he wants to draw, and how he can draw it most plainly and promptly. Decision of execution should always be the result of complete knowledge of the thing to be drawn; if from any other source, it will assuredly be only heedless scrawling, bad in proportion as it is energetic and decided. The chapter on Perspective is full and well illustrated, and useful to architectural or mechanical draughtsmen, may-be, but little so to artists. There are, indeed, no laws of perspective which the careful draughtsman from Nature need ever apply, for his eye will show him the tendency of lines and the relative magnitude of bodies quicker than he can find them by the application of the rules of perspective,--and with much better result, since all application of science _directly_ to artistic work endangers its poetic character, and almost invariably gives rise to a hardness and formalism the reverse of artistic, leading the artist to depend on what he knows ought to be rather than on what he really sees, a tendency more to be deprecated than any want of correctness in drawing. The book contains chapters on artistic processes and technical matters generally, making it a useful hand-book to amateurs; but all that is really valuable to a young student of Art might be compressed into a very few pages of this ponderous book. To follow its prescriptions _seriatim_ would be to him a serious loss of time and heart. _The New American Cyclopaedia_. A Popular Dictionary of General Knowledge, Edited by GEORGE RIPLEY and CHAS. A. DANA. Vol. II. New York: D. Appleton & Co. 8vo.