MESSRS. MUNN ' CO., in connection with the publication of the SCIENTIFIC AMERICAN, continue to examine improvements, and to act aa Solicitors of Patents for Inventors. In this Hue of business they have had forty-one years' experience, and now have tmequaud 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, 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 Pa- ! tents, etc. We also send, ireeof charge, a Synopsis of Foreign Patent Laws, showing the cost and method of securing patents in all the principal countries of the world. MXTNN CO., Solicitors of Patent*, 361 Broadway, New York. BRANCH OFFICKS.-No. m and m F Street, Pacific Building, near 7th Street) Washington, D. C.