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 experience, and now haye vnequcded iqcuitJUe for the preparation of Patent Drawings, Specifications, and the prosecution of Application for Patents in the United States, Canadofa.A and Foreign Countries. .Messrs Munn & Co. also attend to tbe preparation of Caveats. Copyrigbts 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 ot charge, on application. containing full information about Patents and how to pro" cure them; directions -concerning Labels. Copyrights, Delign" Patents, Appeals. Roissues. Infringements, Assignments, Rejected Cases, Uints on the 'sale of Patents, etc. We also send, Ireeof charge, a SynopsIs of Foreign Patent Laws, showing the CORt and .method of securing patents in all the prinCipal countries of the irorld. .'INN &. CO., S_ol1cUora ot PaieDU, 381 Broadway, New York. BRANCH onriCKS.No. 622 and 62* F Street, Pacific Building, near 7th Street, Washington, D.C.