Messrs, Munn & Co., in connection with the publica-tion of the ScientiFIC American, continue to examine Improvements, and to act as Solicitors of Patents for Inventor2. In this line of business they have had over t l irty YIars' expIriencI, and now have unqualed facilities for the Preparation of Patent Drawings, Specifications, and the Prosecution of Applications for Patents in the United States, Canada, and FJreign Countries. Messrs . Munn & Co. also attend to the preparation of Caveats, Eegistration of Labels, Copyrights for Books, Labels, Reissues, Assignments, and Reports on Infringements of Patents, All business intrusted to them is done with special care and promptness, on very moderate terms. "We send free of charge, on application, a pamphlet containing further information about Patents and how to procure them; directions concerning Labels, Copyrights, .esigns, Patent., Appeals, Reissues, Infringements, Assignments, Rejected Clses, Hints on the Sale of Patents, etc. Forei(n Patents,-We also send,free Of charge, I Synopsis of Foreign Patent Laws, showing the cost and method of securing patents In all tie principal countries of the world. American inventors should bear il mind that, as a general rule, any invention that i? valu, able to the patentee hI this country is worth equally as much in England andsome other foreign countries. F jive pateUB-embracing Canadian, English, .ermim, French, an, \ Belgian-will secure to an inventor the ex-clnsive mO.lopoly to his discovery among about onI hund"Id and FIFTY millions of the most intelligent people in the world. The facilities of business and steam communicat'on are such that patents can be obtained abroad by our citizens almost as easily as at home. The expense to apply for an English patent is $75; German, $100; FreRch, $100; Belgian, $100; Canadian, $50. Copies of Patents.-Persons desiring any patent issued from 1e36 to November 20, 1866, can be supplied with official copies at reasonable cost, the price depending upon the extent of drawings and length of specifications. Ay patent issued since November 20, 1866, at which time the Patent Office commenced printing the drawings and specificatioRs, may be had by remitting to this office $1. A copy of the claims of any patent issued since 1836 will be furnished for $1. When ordering copies, please to remit for the .are as a40ve, and state name of patentee, title of invention, and date of patent. A pamphlet, containing full directions for obtaining United States"atents sent free. A handsomely bound Reference Book, gilt edges, contains 140 pages and many engravings and tables important to every patentee and mechanic, and is a useful hand book of reference for everybody, Price 25 cents, mailed free, Adress, MUNN & CO., Publishers SCIENTIFIC AMERICAN, 3" Park Row, New York. BRANCH OFFICEComer of . and 7th Streets, Washington. D. C.