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, Reissues, Infringements, Assignments, Rejected Cases. Hints on the Sale of Patents, etc. We also send, _free of charge_, a Synopsis of Foreign Patent Laws, 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 OFFICES.--Nos. 622 and 624 F Street, Pacific Building, near 7th Street, Washington, D.C. End of Project Gutenberg's Scientific American Supplement No. 819, by Various