INVENTORS, MANUFACTURERS AND FARMERS. THIRTEENTH YEAR! NEW PROSPECTUS OP THE SCIENTIFIC AMERICAN. This work differs materially from other publications, being an Illustrated Periodical, derated to the promulgation of information relating to the various Mechanical and Chemical Akts, Manufactures, Agriculture, Patents, Inventions, Engineering, Mill Wokic, and all interests which the light of Practical Science is calculated to advance. Every number of the SCIENTIFIC AMERICAN contains eiglit pages of reading matter, abundantly illustrated with from five to eight Engravingsall of which are expressly engraved for this publication. All the most valuable patented discoveries are delineated and described in its issues, so that, as respects inventions, it may be justly regarded as an Illustrated Repertory, where the inventor may learn what has been done before him in the same field which he is exploring, and where he may bring to the world a knowledge of his own achievements. Iieports of American Patenta granted are also published every week, including Official Copies of all the Patent Claims. These Patent Claims are furnished from the Patent Office Records expressly for this paper, and published in the SCIENTIFIC AMERICAN in advance of all other publications. Mechanics, Inventors, Engineers, Chemists, Manufacturera, Agriculturists, and people in every profession of life, will find the SCIENTIFIC AMERICAN to be of great value in their respective callings. Its counsels and suggestions will save them hundreds of dollars annually, besides affording them a continual source of knowledge, the value of which is beyond pecuniary estimate. Much might be added to this Prospectus, to 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 space. TEEMS OF SUBSCRIPTIONTwo Dollars a Year, or One Dollar for Six Months. 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 prepay postage. CLUB RATES. Five Copies, for Six Months.................$4 Ten Copies, for Six Months.................$8 Ten Copies, for Twelve Months......"/.... $15 Fifteen Copies, for Twelve Months........giiiii Twenty Copies, for Twelve Months......$28 For all clubs of Twenty and over, vearly subscription is only $1 40. Specimen copies will be sent gratis to any part of the country. * B^~ For List of splendid Cash Prize?, payable Janu- 51 aryl, 1858, see Advertisement page. f^ MUNN CO., Publishers and Patent Agents, A No. 128 Fulton street, New York