[Hand->]Our complete book catalogue of 116 pages, containing reference to works of a scientific and technical character, will be sent, free to any address on application. MUNN & CO., PUBLISHERS, 361 BROADWAY, N. Y. * * * * * THE SCIENTIFIC AMERICAN SUPPLEMENT. PUBLISHED WEEKLY. Terms of Subscription, $5 a Year. Sent by mail, postage prepaid, to subscribers in any part of the United States or Canada. Six dollars a year, sent, prepaid, to any foreign country. All the back numbers of THE SUPPLEMENT, from the commencement, January 1, 1876, can be had, Price, 10 cents each. All the back volumes of THE SUPPLEMENT can likewise be supplied. Two volumes are issued yearly. Price of each volume. $2.50 stitched in paper, or $3.50 bound in stiff covers. COMBINED RATES.--One copy of SCIENTIFIC AMERICAN and one copy of SCIENTIFIC AMERICAN SUPPLEMENT, one year, postpaid, $7.00. A liberal discount to booksellers, news agents, and canvassers. MUNN & CO., PUBLISHERS, 361 BROADWAY, NEW YORK, N. Y. * * * * * SPECIAL ANNIVERSARY NUMBER of the SCIENTIFIC AMERICAN, containing eighty illustrations and a resume of fifty years of progress in fifteen branches of science. 72 pages. Single copies, 25 cents, sent by mail in United States, Canada, and Mexico. Foreign countries 8 cents extra. MUNN & CO., 361 BROADWAY, NEW YORK. * * * * * 1897 SUPPLEMENT CATALOGUE READY! The publishers of the SCIENTIFIC AMERICAN announce that an entirely new 48 page SUPPLEMENT Catalogue is now ready for distribution, and will be sent free to all on application. MUNN & CO., PUBLISHERS, 361 BROADWAY, NEW YORK CITY. * * * * * BUILDING EDITION OF THE SCIENTIFIC AMERICAN. Those who contemplate building should not fail to subscribe. ONLY $2.50 A YEAR. Semi-annual bound volumes $2.60 each, yearly bound volumes $3.50 each, prepaid by mail. Each number contains elevations and plans of a variety of country houses; also a handsome COLORED PLATE. MUNN &. CO, 361 BROADWAY, NEW YORK. * * * * * PATENTS! MESSRS. MUNN & CO., in connection with the publication of the SCIENTIFIC AMERICAN, continue to examine improvements, and to act as Solicitors of Patents for Inventors. In this line of business they have had _fifty years' experience_, and now have _unequated facilities_ for the preparation of Patent Drawings, Specifications, and the prosecution of Applications for Patents in the United States, Canada, and Foreign Countries. Messrs. Munn & Co. also attend to the preparation of Caveats, Copyrights for Books, Trade Marks, Reissues, Assignments, and Reports on Infringements of Patents. All business intrusted to them is done with special care and promptness, on very reasonable terms.