MESSRS. MUNN & CO.. in connection with the pub-lication of lae SCIENTIFIC AMIRICAN, continue to examine Improvements, and to act as Solicitors of Patents for Inventors. In this line of business they have had forty years' experience, and now have unequaled facilities for j the preparation of Patent Drawings, Specifications, and the prosecution of Applications for Patents in the United States, Canada, and Foreign Countries. Messrs. Mimn ( o. also attend to the preparation of Caveats, Copyrights for Books, Labels, Reissues, Assignments, and Reports on Infringements of Parents. Ail 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 Ta-tents, etc. We also send, free of charge, 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'Patents. 61 Broadway, Ne.w York. BRANCH OFFICE.Corner of F and 7th Streets, WaehiDgt 011, D. C,