MESSRS. MUNN amp;co.. in connection with the publi. cation of the Scientific American, continue to examine improvements, and to act as Solicitors of Pateuts for lnventors. In this line of business they have had jortY-One yearsapos; experience. and now have apos;unequaled facilities for the preparation of Patent Drawings, Specifications, and the prosecution of Applications for Patents in the United States, Canada. and Foreign Countries. Messrs. unn amp;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 speClal care and promptness, on very reasonable terms. A pamphlet sent free of charge, on application, containing full information about Patents and how to pro-care them; directions concerning Labels, Copyrights, Designs, Patents, Appeals, Reissues Infringements, Assignments, Rejected Cases. Hints on the Sale of Pa-tents, etc. W e also send. free of charge. a Synopsis of Foreign Patent Laws. showing the cost and method of becurlng patents in all the principal countries of the world. MUNN amp;CO., Solicitors of Patenapos;., 361 Broadway. New York. BRANCR OFFICB3.-No.622 and 624 F Street, Pa-clflc Building, Dear 7th Street, Washington, D. C.