MESSRS. 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 me reference, and now have 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 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 i c turning full information about Patents and how to procure them; directions concerning Labels, Copyrignts, Designs, Patents, Appeals, Rnissues, Infringements, As- aignramts, Rejected C..es. Hints on the Sale of Patents, etc. We also send, free 0 ctan, a Synopsis of Foreign Patent Laws, showing the coat and method of securing patents in all the principal countries of the world. MlINN CO., Solicitors ot Patents, 861 Broadway, New York. BRANCH OFFICE8.-No. 62 and 624. F Street, Pacific Building, near 7th Street, Washington, D. C. '.