MESSBS. 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 years' experience, and now have unequaUd faciliUea 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 then: 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, Patents, Appeals, Reissues, Infringements, Assignments, Rejected Cases, Hints on the Sale of Patents, etc. ' We also send, free of charge, a Synopsis of Foreign Pa- I tent Laws, showing the cost and method of securing patents in all the principal countries of the world. MVNN CO., Solicitors of Patents, 361 Broadway, New York. BRANCH OFFICE.Corner of F and 7tJ Streets. Washington, I). C.