MESSRS. MITNN 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 ty years' experience, and now have imequaletZ facilities for the preparation of Patent Drawings, Specifications, and the prosecution of Applications for Patents in the United States, Canada, and Foreign Countries. Messrs. Mnnn 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 tliem; directions concerning Labels, Copyrights, lybsigns, Patents, Appeals. Reissues, Infringements, Assignments, Rejected Cases, Hints on the Sale of Patents, etc. We also send./re af charge, a Synopsis of Foreign Patent Laws, showing the cost and method of securing patents in all the principal countries of the world. MUNN A- CO., Solicitors of Patents, 361 Broadway, iew York. RRANCH OFFICE--Comer of F and 7th Streets, Washington. D. C.