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-one years' experience, and now have wnequaLed fac ivies for the preparation of Patent Drawings, Specifications, and the prosecution of Applications for Patents in the United States, Canada, and Foreign Countries. Messrs Mnnn Co. aiso 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, containing full information about Patents andhowto procure them; directions concerning Labels, Copyrights, Designs, Patents, Appeals, Roisaues, Infringements, Assignments, Rejected Cases, Hints on the Sale of Patent , etc We also send, freeof 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 OFF1CK8.-NO. 622 and 624 F Street, Pa-ctdc Building, near 7th Street, Washington, D, c.