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 fortv-orfyears experience, and now nave un equaled facilies 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. alsoattend to the preparation of Caveats. Copyrights for Bocks, Labeis, 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, Rnissues, Infringements, Assignments, Rejected Cases, Hints on the Sale of Patents, etc. . We also send, ireeof charge, a Synopsis of Foreign Pa-tent Laws, showing the cost and method of securing patents in all the principal countries'of the *orld. MUNN & CO., Solicitors of Patents, 361 Broadway, New York. BRANCH OFFICES.No. 622 and 624 F Street, Pacific Building, near 7tn Street, Washington, D. C.