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 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. messrs Munn&Co. also attend to the preparation of Caveats. Copyrights for Books. Labels, Reissues, assignments, and Reports on Infringements of Patents. All business interested 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. Rn.issues. Infringements, Assignments, Rejected Cases. Hints on the Sale ot Patente, etc. We also send . .freeo! charqe. a SynopSIS of Foreign Pa tent Laws, showing the cost and method of securing patents in all the prinCipal countries of the world. MUNN & (0., Solicitor! of Paten"'_ E 1 Br H adway. New York. BRANCH OFFICKS.-No. 622 and 624 F Street, PacifC Rni1dinJ. near 7tb Street. Washtngton. n. D.C