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 business they have had forty one years wise Hence, and now have unequaled facilities 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 them isdonewith 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, -issues, Infringements, Assignments, Rejected Cases, Hints on the Sale of Patents, etc. We also send, free of charge, a Synopsis of Foreign Patent Ijaws, 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 OFFICE&-No. 622 and 624 F Street, Pacific Building, near 7th Street,Washington D. C.