MESSRS. MUNN CO., in connection with the publication uf the SCIENTIFIC AMERICAN, continue to examine improvements, and to act as Solicitors of Patents for jnvfrilorsi. In this line (! business iliey have had forty-one years1 wpenence, and now "have unequakd facilities for the preparation of Patent fr,iwint;s, Specifications, and tlie prosecution if A ppii-;itu.ns for Patents in the United States, Canada, and 1* oreign 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 careand promptness, on very reasonable terms. A pamphlet sent free of chartie, 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. freof charge, a Synopsisof Foreign Patent Laws, showing the cost and method of securing patents in ali the principal countries of the world. MUNN CO., Solicitors of Patents, 3(51 Broadway, New York. BRANCH OFFICES.--No. 622 and 624 F Street, Pa-Ciflc Building, near 7th Street. Washington, D. C.