MESSRS. MUNN & CO., in connection with the publication oi the SCIENTIFIC AMERICAN, continue to examine iajprovements, and to act as Solicitors of Pateuts for Invfelore. In this line of business they have had forty-one yeurs'' experience, and now have unegualed facilities for the preparation of Patent Drawings, Spcifications, 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 lull 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, 3fal Broadway, New York. BRANCH OFFICBS.-No. 622 and KM F Street, Pa-dflc Buiimoff, neftT 7tli street, WastUneton, D. C.