Is an OBSERVATORY, or LOOK-OUT, which would be an appropriate feature in the grounds of an Italian villa. The top balcony is attained by a spiral staircase in the centre. Where navigable waters lie in view, the use of the observatory is infinitely more interesting than in ordinary inland scenery. A mounted glass is indispensable to the complete enjoyment of the opportunity thus afforded for the contemplation of distant objects. OF PRACTICAL AND SCIENTIFIC BOOKS, PUBLISHED BY HENRY CAREY BAIRD, INDUSTRIAL PUBLISHER, No. 406 WALNUT STREET, Any of the Books comprised in this Catalogue will be sent by mail, free of postage, at the publication price. MY NEW AND ENLARGED CATALOGUE, 95 pages Svo., with full descriptions of Books, will be sent, free of postage, to any one who will favor me with his address. ARMENGAUD, AMOUROUX, AND JOHNSON. THE PRACTICAL AR DRAUGHTSMAN'S BOOK OF INDUSTRIAL DESIGN, AND MACHINIST'S AND ENGINEER'S DRAWING COMPANION: Forming a complete course of Mechanical Engineering and Architectural Drawing. From the French of M. Armengaud the elder, Prof. of Design in the Conservatoire of Arts and Industry, Paris, and MM. Armengaud the younger and Amouroux, Civil Engineers. Rewritten and arranged, with additional matter and plates, selections from and examples of the most useful and generally employed mechanism of the day. By WILLIAM JOHNSON, ASSOC. Inst. C. E., Editor of "The Practical Mechanic's Journal." Illustrated by 50 folio steel plates and 50 wood-cuts. A new edition, 4to. $10 00 BLOT.-A COMPLETE GUIDE FOR COACH PAINTERS. Translated from the French of M. ARLOT, Coach Painter; late Master Painter for eleven years with M. Ehrler, Coach Manufacturer, Paris. With important American additions. ARROWSMITH-PAPER-HANGER'S COMPANION: $1 25. A Treatise in which the Practical Operations of the Trade are |