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 business they I)ave had thirty-eight years' ewperience, and now have -imequaled facies for Hie 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, con-toining fnl information about Patents and how to procure them; directions concerning I,abels, Copyrights, Designs. Patents, Appeals. Reissues, Infringements, As-siguments, Rejected Cases, Hints on the Sale of Patents, etc. We also send. fre of charge, a Synopsis of Foreign Patent Laws, showing the cost and method of securing patents in all the principal countries of the world. ralINN : CO., Solicitors ot" Patents, 261 Broadway, New York. BRANCH OFFICE - Comer of F and 7th 8, Wa!!hingtoa. D. C.