MESSRS. MUNN & CO., in connection with the publication of the SCIENTIFIC AMERICAN, continue to examine improvements, and to act as Solicitors of Patenta for Inventors. in this line of business they have had forty-onz years experience, and now have unequaled facilities for the preparation of Patent Drawings, Specifications, and the prosecution of Application for Patents in the United States, Canada, and Foreign Countries, M essrs Munn & Co. also attend to the preparation of Caveats. Copyrights for Books. Labels, Reissues, A ssignments. and Reports 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 how to procure them; directions concerning Labels, Copyrights, Designs, Patents, Appeals, Roissues, Infringements, Assignments, Rejected Cases, Hints on the Sale of Patents, etc. We also send, ireeof charge, a Synopsis of Foreign Patent Laws, showing the cost and method of securing patents in all the principal countries of the world. Munn & CO., Solicitors of Patents, 361 Broadway, New York, BRANCH OFFICES.-NO. 622 and 624 F Street, Pacific Building, near 7th Street. Washington, D. C.