MESSRS. MUNN & CO.. in connection wh the publication of the SCIENTIFIC AMERICAN. continue to examine improvements. and to aet as Solicitors of Patents for Inventors. In this line of business they have had fifty one years experience, and now have unequaled facilitties for the preparion of Patent Drawings, Specifications, and the procution of A pphcations for Patents in the United States. Canada. and Foreign Countries. .Messrs Munn & Co. soatt to teprerarion ofCaveats. (otB for lbel issussiKaments. and Reports on Infringemes of Patents. All business intrusted to them is do with special care and promptness, on very reasonable terms. A pamphlet sent free of cbaree, on application. con-tami,&lUraation about Patents and how to procure them; ions tticrinp IabeU, Copglii Designs, Patents, Appals. Rflissues, Infringemnts, Assignments, Rejected Cases, Hints on the Sale of Patents, eetc. We also send, reeof charge, a Synopsis of t'oreign Patent Laws, showing the cost and method of securing patents in all the principal countries of the world. IITJNN &; CO., Solicitors ot Patents, 361 Broadway, New York. BRANCH OFFICRP.-No. 622 and 624 F Street. Pa. OlIlo Bailding, near 7th Street, Washington, D. C.