MESSRS. MUNN & CO., in connection with the puhli-catlon of the Scirntipic American, continue to examine improvements, and to act as Solicitors of Patents for Inventors. In this line of business they have had forpy-one years' experience, and now have unequaled facHUies for the preparation of Patent Drawings, Specifications, and the grosecution of Applications for Patents in the United tales, Canada.and Foreign Countries. Messrs. Munn & Co. also attend to the preparation of Caveats, Copyrights for Books, labels, Keissues, Assignments, and Keports 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 bow to procure them; directions concerning Labels, Copyrights, Designs, Patents, Appeals, Reissues, Infringements, Assignments, Rejected Cases. Hints on the Sale of Patents, etc. We also send,/r!0.f charge, a Synopsis of Foreign Patent Laws, showing the cost and method of securing patents in all the principal countries of the world. MUIVN dc CO., Solicitors of Patents, 361 Broadway, New York. BRANCH OFFICES.--No. 628 and 624 P Street, Pa-llflc Bnildlng, oesr Tth Street, Washington, D. C.