MESSRS. MUNN & CO.. in connection with the publication of the SCIENTIFIC AMEKICAN, continue to examine improvements, and to act as Solicitors uf Patents for Inventors. In this line of business they have had forty-one years' erperi nce. and now have uneqitfdeci faciliUes for the preparation of Patent Drawings, Specifications, 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 charge, on application, containing full information about Patents and how to procure them; directions concerning Labels, Copyrights, Designs, Patents, Appeals. Reissues, Infringements, As-sifrnments. Rejected Cases, Hints on the Sale of Patente, etc. We also send, .free of charge, a Synopsis of li'Oreign Patent Law8, showing the cost and method of securing patents in all the principal countries of the jrorld. MUNN & CO., Solicitors oi Patenta, 361 Broadway, New York. BRANCH OFFICES-No. 622 and 624 F Street, PB , office Building, near 7th Street, Washington, D. C.