MESSRS. MUNN & CO., 1n connection with the publication of the SCIENTIFIC AMKHICAN, continue to examine improve- ments, and to act as Solicitors of Patents for Inventors. In this line of business they have had forty-ftm years1 experience, and now have unequaled facilities 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, Copy- rights for Books, Labels, Reissues, Assignments, and Reports on Infringements of Patents. All business in- ; trusted to them is done with special care and prompt- i ness, on very reasonable terms. A pamphlet sent free of charge, on application, con- taining full information about Patents and how to pro- j cure them; directions concerning Labels, Copyrights, Designs, Patents, Appeals, Reissues, Infringements, ! Assignments, Rejected Cases. Hints on the sale of Patents, etc. We also send, free of charge, a Synopsis of Foreign Pa- tent Laws, showing the cost and method of securing Patents in all the principal countries of the world. MUNN & CO., Solicitors of Patents. 361 Broadway, New York. BKANCH OFFICES.--No. 622 and 624 F Street, Pa- citie Building, near 7th Street, Washington, O. C,