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, with hints for procuring advances on inventions. Address MUNN & CO., 261 BROADWAY, NEW YORK. Branch Office, cor. F and 7th Sts., Washington, D. C.