MESSRS. MUNN& CO., in connection with the publication of the SCIENTIFIC AMERICAN, continue to examine improvements, and to act as Solicitors of Patenta for Inventors. In this line of business they have had forty-one years' experience, and now have unequaUd facilities 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 ?or 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, Patenta, Appeals, Reissues, Infringements, Assignments, Rejected Cases, Hints on the Sale of Pa-tente, etc We also send, free of charge, a Synopsis of Foreign Pa tent Laws, showing the coat and method of securing patents in all the principal countries of the world. MUNN it CO., Solicitors of Patents, 361 Broadway, New York. BRANCH OFFICES.--No. 622 and 624 F Street, Pacific Building, near 7th Street, Washington, D. C. PRINTING INKS. THE " Scientific American " ie printed with CHAS. ENETT JOHNSON CO.'S INK. Tenth and Lorn, bud Ste., Phila., and 47 Rose St., opp, Duane St., ?. Y.