MESSES. MUNN & CO in connection with the publication of tlie Scientific Ambbican, continue to examine Improvements, and to act as Solicitors of Patents for Inventors. In this line of business tbey have had thirty-eight years' experience, and now have mequaled facilities for the preparation of Patent Drawings, Specifications, and the prosecution of Applications for Patents in the Dnited States, Canada, and Foreign Countries. Messrs. Munn & Co. also attend lo tlie 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 pampWet sent free of charge, on application, containing full infoMnation about Patents and how to pro. cure them; directions concemiDg Labels, Copyrights, Designs, Patents, Appeals, Eeissnes, Infringements, As-jignments, Eejected Cases, Hints on the Sale of Patents, etc. We also send, free of charge, a Synopsis of Foreign Patent Laws, snowing the cost and method of securing patents in all the principal countries of the world. MUNN Sc CO., Solicitors or Patents, 361 Broadway, New Tork. BEANCH OFFICR-Comer of F and lib Stteeta, Washington, D. C.