Any person who has made a new discovery or invention can ascertain, free of charge, whether a patent can probably be obtained, by writing to MUNN & Co. We also send free our Hand Book about the Patent Laws, Patents, Caveats. Trade Marks, their costs, and how procured. Address MUNN & CO., 261 BROADWAY, NEW YORK. Branch Office, cor. F and 7th Sts., Washington, D.C. End of the Project Gutenberg EBook of Scientific American Supplement, No. 458, October 11, 1884, by Various