MESSRS. MUNN & CO., in connection with the pub lication of the Scientific Amebican, continue to examine Improvements, and to act as Solicitors of Patente for Inventors. In this line oi business they have had thirly-eiglU years' experience, and now have vmgualed f acuities for the preparation of Patent Drawings, Specifications, and the prosecution of Applications for Patente in the United States, Canada, and lOreign Countries. Messrs. Munn & Co. also attend to the preparation of Caveats, Copyrights for Books. Labels, Eeissues, Assignments, and Beports 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, Beissnes, Infringements, Assignments, Rejected Cases, Hints on the Sale of Patents, etc. We also send, free of charge, a Synopsis of Foreign Patent Laws, showing the cost and method of securing patents in all the principal countries of the world. MUNN & CO., Solicitors of Patente, 261 Broadway, New York. BBANCH OFFICE.Comer of J1 and 7th Streets Washington, D. C.