MESSRS. MUNN & CO., in connection with the pub hcation of the SCIENTIFIC AMERICAN, contmue to ex amine Improvements, and to act as Solicitors of Patenti fpr inventors. In this line of business tbey have had thirty-ngh years' experience, and now have unegualed facaitie8 fo: the preparation of Patent Drawings, Specifications, ant the prosecution of Applications for Patents in thi United States, Canada, and Foreign Countries. Messrs Munn Co. also attend to the preparation of Caveats Copyrights for Books. Labels, Reissues, Assignments and Reports on Infringements of Patents. Ail businesf intrusted to them is done with special care and prompt ness, on very reasonable terms. A pamphlet sent free of charge, on application, con mining full information about Patents and how to pro. cure them; directions concerning lsabels, Copyrights, Designs, Patents, Appeals. Reissues, Infringements, M signments, Rejected Cases, Hints on the Sale of Patents, etc. We also send. free a' charge. a Synopsis of Foreigi Patent Laws. showing the cost and method of securing patents in all the principal countries of the world. MUNN ; CO.. Solietors of Patents, 361 Broadw, New York. BRANCH OFFICE.--Corner of F and 7th Streets Washingjon, D. C.