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 businees they have had thirty-five yeaTS' experience, and now have unequaled facilities f01 the preparation of Patent Drawings, Specifications, and tbe prosecntion of Applicatious for Pat.ents in the United StateB, Canada, and Foreigu Countries. Messrs. Munn & Co. also attend to the preparation of Caveats, CopyrightB for Books. Labels, Reissues, Assignments, and Reports on Infringements of Patents. All basincBB intrusted to them is done with special care and prompt-ness, on very reasonable terms. A pamphlet sent free of charge, on application, con taining fnll informatiou about Patents and how to pro cure them; directions concerning IJRbels, Copyrights, Desiglls, Patents, Appeals. Reissues, Infringements, Assignments, Rejeoted Oasee, His on the Sale of Patents, etc. We also send. frte qf charge, a Synopsis of Foreign Patent Laws, showing the cost and method of secnring patents in all the principal counlries of the world. MtTNIf & CO. Solicitors of Patents, 261 Broadway, New York, BRANCH OFFICE -Corner of F and 7th Streets, Washington. D. C.