MESSRS. MUNN & CO., in connection with the publication of the Scientific American, continue to examine improve- ments, and to act as Solicitors of Patents for Inventors. Tn this line of business they have had fortu-fjve years7 cxixrinwe, and now have uncquahd facilities for the preparation of Patent Drawings, Specifications, and the prosecution of Applications for Patent in the United States, Canada, and Foreign Countries. Messrs. Munn & Co. also attend to the preparation of Caveats, Copyrights for Books, Labels, Reissues, Assignments, and Reports on Infringements of Patents. All business intrusted to them is done with special care and promptness, on very reasonable terms. A pamphlet sent free of charge, on application, containing full information about Patents and how to procure them; directions concerning Labels. Copyrights, Designs, Patents, Appeals, Reissues, Infringements, Assignments, Rejected Cases. Hints on the sale of Patents, etc. We also send, free of charqe, a Synopsis of Foreign Patent Laws, showing the cost and method of securing Patents in all the principal countries of the world. MUNN fc CO., Solicitors of Patents, 361 Broadway, New York. BRANCH OFFICES.--No. 622 and 624 V Street, Pa-olflc Building, sear 7th Street, Washington, D. C.