MESSRS. MUNN CO. in connection with the publication of the SCIENTIFIC A"ERICAN, continue to examine improvements, and to act as Solicitors of Patents for Inventors. In this line of business they have had forty-five years' experience, and. now have nneqimled 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,1gf Labels, Reissues, Assignments, and Reports ltemon Infringements of Patents. All business intrusted to Pthem 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 tnem: directions concerning Labels, Copyrights, Designs, Patents. Appeals, Reissues, Infringements1 Designs,ASSignments, ReJected Cases. Hints on the sale or1 Patents, etc. We also send, free of chargf, a Synopsis of Foreign Patent Laws, showing the cost and method of securing Patents in all the pnncipal countries of the world. MUNN CO., Solicitors of Patents. 3fH Broadway, New York. BRA.NCH OFFICES.--No. 622 and 624 F Street, P pifle amlding, aew Ttb Street, Washington, D.C.