OF THE SCIENTIFIC_AMERICAN. FOURTEENTH YEAR! MECHANICS, IflVENTORS, MILLWRIGHTS CHEMISTS, FARMERS AND MANUFACTURERS This valuable and widely circulated journal enters upon Its FOURTEENTH YEAR on the 11th of September. It la an Illustrated Periodical, devoted to the promul gation of information relating to the various MECHANICAL and CHEMICAL ARTS, MANUFACTURES, AGKIOULTCEF, PATENTS, INVENTIONS, ENGINEERING, MILL WORK, and all interests which the light of PRACTICAL SOIHNOB is calculated to advance. The SCIENTIFIC AMERICAN is printed once a week, in convenient quarto form for binding, each volume being accompanied by a handaome frontispiece, with a complete index of contents, and presents an elegant typographical appearance. Every number contains eight large pages of read-ng matter, abundantly illustrated with from five to eight ENGRAVINGS— all of which are expressly engraved for this publication. All the most valuable patented discoveries are delineated and described in ita issues, so that, as respects inventions, it may be justly icgarded as an Illustrated Repertory, where the inventor may learn what has been done before him in the aame field which he is exploring, and where he may publish to the woild a knowledge of his own achievements. Reports of American. PatentB granted are also published every week, including offlcial copies of all the PATENT CIAIMS. Theso Patent Claims are furnished from the Patent Office Records exrressly for this paper, and published in the SCIENTIFIC AMERICAN in advancer fall other publications. The contributors to the SCIENTIFIC AMERICAN are among the most eminent scientific and practical men of the times. Thn editorial department is universally acknowledged to b e conducted with great ability, and to be distinguished, not only for the excellence and truthfulness of its discussions,-hut for the fearlessnrea with which error is combated and false theories' are exploded. Mechanics, Inventors, Engineers, Chemists, Manu-facturen, Agriculturists, and people in every profession of life, will find the SCIENTIFIC AMERICAN to be ot great value in their respective callings. Its counsel a md suggestions will save them hundreds of dollars annually, besides affording them a continual source or 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 whichevery Inventor, Mechanic, Artisan, and Engineer in the United StateBslioxild patronize; but the publication is so thoroughly known throughout tha country that werefrainfrom occupying further space to enumerate the reasons why we should have one hundred thousand subscribers instead of twenty-five thousand— which is now our circulation—and leave the matter in the hands of each of our : rese ut subscribers to recommend its worth to a neighbor or friend, who may have been so unfortunate as not to have been a subscriber heretofore. TERMS OF SUBSCIPRTION—Two Dollars a Year, or One Dollar for Six Months. CLU1. RATES, Five Copies, for SixMontha................34 Ten Copies, for Six Months.................8 Ten Copies, for Twelve Months...........S15 Fifteen Copies, for Twelve Months........$22 Twenty Copies, for Twelve Months.......#48 For all clubs of Twenty and over, the yearly subscription ia only $1 40. Names can be sent in at "different times and from different Poet Offices. Specimen copies will be sent gratis to any part of the country. Southern, Western and Canadianmoney 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 MUNN & CO., Publishers and Patent Agents, No. 128 Fulton street, New York.