MESSRS. MUNN & CO., in connection with the publication of the SoiKNTiFic AMERICAN, continue to examine improvements, and to act as Solicitors of Patents for Inventors. In this line of business they have had forty-one years1 experience, and now have nneqwiled 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 charee, 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 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 Patents, 361 Broadway, New York. BRANCH OFFICES.No. 622 and 624 F Street, Pa-. joiflc Building, near 7th Street, Washington, D. C.