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 bnsiness they have had thirty-eight years experience, and now have equaled facilities for the preparation of Patent Drawings, Specifications, and the prosecution of Applications for Patents in the United States. Canada, and Foreign Countries. lessrs. Munn & Co. also attend to the preparation of Caveats, Copyrights for Books. Labels, Reissues, Assignmelts, and Reports on Infringements of Patents. A business intrusted to them is done with special care and promptness, on very reasonable terms. A pamphlet sent free of charge, on application, con . tining fnll information about Patents and how to procure them; directions concerning I,nbels, Copyrights, Desigus, Patents, Appeals, Reissues, Infringements, Assignments, Rejected Cases, Hints on the Sale of Patents, etc. We also send, free Qr charge, " Synopsis of Foreign Patent Laws, showing the cost and method of secnring patents in aJl the prinCipal conntries of the world. llNN ' (O., Solicitors of Patentl, 361 Broadway, New York. BRANCH OFFICE.-Corner of F and 7th Strete WaShington, D. C.