MESSRS. MUNN & CO., fn connection with the publication of the SCIENTIFIC AMERICAN, continue to examine ImproTe-ments, ana to act as Solicitors of Patents for Inventors. In this Une of business they have had forf, years' e.rpenena, and now have miequie iacmtm for the preparation of Patent Drawings, Specifications, and the OBosecutlon 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 eoneemlng Labels, Copyrights, Designs, Patents, Appeals, Reissues, Infringements, Assignments, Rejected Cases. Hints on the sale oi Patents, etc We also send, free of charge, a Synopsis of Foreign Patent Laws, showing the cost and method of securing Patents in 11 the principal countries of the worlds MUNN &CO., Solicitors of Patents. 361 Broadway, New York. BBANCH OFFICKS.-No. 622 and 624 F Street, Pa-clflo Bnlldlne sear 7th Street, Washington, D.C.