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 have had forty-two years' experience, and' now have unequaled facilities,. for the preparation of Patent Drawings, Specifications, and the rosecution of Applications for Patents in the United sates, 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 the 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 pro- core 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. a MUNN. k CO., Solicitors of Patents, 361 Broadway. New York. BRANCH' OFFTCES.-No.622 and 624 F Street, Pa- 0140 Building, near 7th Street. Washington, D. C.