MESSBS..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-on- years experience, and nrow nave unegualed facilities for the preparation of Patent Drawings, Specifications, and the prosecution' of Applications for Patents in the united* States, Canada, and Foreign Countries. Messrs Murm * 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, con-tainipg full information about Patents and how to procure them; directions concerning Labels, Copyrights, Designs, Patents, Appeals. Rfiissues, 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. MIJNN ic CO., Solicitors of Patents, 361 Broadway. New York. BRAr'CH OFF1CK8.-NO. 622 and 624 F Street, Pa-Oiflc B11 ldtng, near i'ta street, Washington, D. c.