Messrs. Munn & Co., in connection with the publication of the Scientific American, continne to examine, Improvements, and te, act ae Solicitors of Patents for inventors. In this line of businesA they have had over thirty, years' experience. and now have unequaled jacilities for thE Preparation of Patent Drawings, Specifications, and the Prosecution of Applications for Patents in the United States, Canada; and Foreign Countries. Messrs. Munn &Co. also attend to the preparation of Caveats, Registration 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 uamphlet containing further 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. Foreiyn p(ztP't,.,-We also send, free of charge, a Synopsis ot Foreign" Patent Laws, showing the costald method of securing patents in all the principal countries of the world, American inventors should hear in mind that, as a general rule, any invention that is valn-able tG the patentee, in this country is worth equally as mnch in England and some other foreign countries. Five patents-embracing Canadian, English, German, French, and Belgian-will secure to an inventor the exclusive monopoly te his discovery among about one hundred and fifty millions of the most intelligent peopl .. in the world. The facilities of business and steam communication 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; Gel-man, $100; French, $100; Belgian, $100; Canadian, $50. Oopies of Patents.-Persons desiring any patent issued from 1836 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. Any patent issned since November 20, 1866, at which time the Patent Office commenced printing the drawings and specifications, may be had by remitting to this office $1, A copy of the claims of any patent issned since 1836 will he furnished for $1. When ordering copies. please to remit for the same as ahove. and state name of patentee, title of invention, and date of patent, A pamphlet, containing full directions for abtaining United States patents, 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 handbook of reference for everybody. Price 25 cents, mailed free. Address MUNN &CO", Publishers SCIENTIFlC AMERICAN, 3' Park Row, New York. BRANCH OFFICE-Corner of J' and 7t/ /Streets, Washington, D. C