MESSRS. MUNN & CO., in connection with the publication of the SCIENTIFIC AMERICAN, continue to examine improvements, and to act as Solicitors ot Patents for Inventors. In this line of business they have had forty-one years' experience, and now nave unegiecUed facilimes for the prparation o Patent Drawings, Specifications, and the ppoaccution 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. AU business intrusted to them is done with special care and promptness, on ver reasonable terms A pamphlet sent free of charge, on application, containing full information about Patents and how to pro-nure them; directions concerning Labels, Copyrights, Designs, Patenta, Appeals. Rnissues, Infringements, As-signments, Rejected Cases, Hints on the Sale of Patents, etc. We also send, fret of charge, a Synopsis of Foreign Patent Laws, showing the cost and method of securin patents in all the principal countries of the irorld. miJNN A: CO., Solicitors ot Patents, 361 Broadway, New York. BRANCH 0FFICB8.-NO. 622 and 624 F Street, Pa. dflo Buliainff, near 7th Street, Washington D. C.