INVENTORS, MANUFACTURERS, AND FARMERS. THIRTEENTH YEAR: PROSPECTUS OF THE SCIENTIFIC AMERICAN. This workdifiera materially from other publications, being an Illustrated Periodical, devoted to the promulgation of information relating to the various Mechani-oal and Chemical Arts, Manufactures, Agriculture, Patents, Inventions, Engineering, Mill Work, and all interests which the light of Pkaotioal Science is calculated to advance. Every number of the SCIENTIFIC AMERICAN contains eight pages of readng matter, abundantly illustrated with from five to eight Engravingsall of which are expressly engraved for this publication. AH the most valuable patented discoveries are delineated and described in its issues, so that, as respecta inventions, it maybe justly iegarded as an Illustrated Repertory, where the inventor may learn what has been done before him in the ame field which he is exploring and where he may bring to the world a knowledge of his own achievements. Keports of American Patents granted are also published every week, including Official Copies of all the Patent Claims. These Patent Claims aJ"e furnished from the Patent Office Kecorda exrressiy for this paper, and published in the SCIENTIFIC AMK RICAN in advance of all other publications. Mechanics, Inventors, Engineera, Chemists, Manufacturers, Agriculturists, and people in every profession of life, will find the SCIENTIFIC AMERICAN to b of great value in their respective callings. Its counsels and suggestions will save them hundreds of dollar annually, besides affording them a continual source of knowledge, the value of which is beyond pecuniaiy estimate. Much might be added to this Prospectus, t prove that the Scientific American is a publication which every Inventor, Mechanic, Artisan, and Engineer in the United States should patronize ; but the publication is so thoroughly known throughout the country that we refrain from occupying further apace. Southern, Western and Canadian money or Post Office stamps, taken at par for subscriptions. Canadian subscribers will please to remit twenty-six cents extra on each year's-subscription, to pre-pay postage. TEEMS OF SUBSCRIPTIONTwoDollarea Year, or One Dollar for Six Months. CLUB KATES, Five Copies, for Six Months............ 4 Ten Copies, for Six Months.......... S S Ten Copies, for Twelve Months...........$15 Fifteen Copies, for Twelve Months.......$2 Twenty Copies, for Twelve Months.......$2S For all clubs of Twenty and over, the yearly aub-acription is only $1 40. Specimen copiee will be sen ' gratis to any part of the country. t MUNN & CO., Publishera and Patent Ageats, No. 128 Fulton atreet, New York