MESSRS. MUNN&CO., in connection with the publication of the Scientific American, continue to examine improvements, and to act as Solicitors of Pateuts for Inventors. In this line of business they have had fortyw years' ah preparation ofPatent drawings,Speciflcation8, and the prosecution of Applications for Patents in the United States. Canada. and Foreign Countries. Messrs M unn&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 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. Reis8ues, Infringements, Assignments, Rejected Cases. Hints on the Sale of Pa,, tents, etc. We also send, free of charge. a Synopsis of Foreign Pa,. tent Laws, showing the cost and method of securing patents in all the p incipal countries of the world. MUNN&CO., Solicitors of Patents, 361 Broadway, New York. BRANCH 0FFICE8.-No. 622 and 624 F Street, Pa- fr Building, Ilear 7th Street, WI18hmgton, D, C.