FOURTEENTH YEAR! MECHANICS, INVENTORS, MILLWRIGHTS, CHEMISTS, FARMERS AND MANUFACTURERS. This valuable and widely circulated journal enters upon its FOURTEENTH YEAR on the 11th of September. It is an Illustrated Periodical, devoted to the pronlul gation of information relating to the various MECHANIOAL andCHEMioALAETs, MANUFACTURES, AGRICULTURE, PATENTS, INVENTIONS, ENGINEERING, MILL.WORK, and all intercsts which the light of PEAOTIOAL SCIENCE ia calculated to advance. The SCIENTIFIC AMERICAN ia prlntea once a week, in convenient quarto form for binding, each volume being accompanied by a handsome frontispiece. with a complete index of contents, and presents an elegant typographical appearance. Every number COD. tains eight large pages of read ng matter, abundantly illustrated with from.five to eight ENGRAVINGS—all of which are expressly eugraved for this publication. All the most valuable pateuted discoveries arc dellncated and described in its issues, so that, as respects inventions, it may be justly 1 egllrded as an Illustrated Repertory, where the inventormay learu what has been done before him in the same field which he is exploring. and where he may publieh to the w orld a knowledge of his own achievements, Reports of American Patents granted Bre also published every week, including official c-opies of all the PA'RENT CLAIMB. These Patent Claims are furnished from the Patent Office Records eXlressly for this paper, and published in the SCIENTIFIC AMERICAN in advance of all other publications. The contributors to the SCIENTIFIC AMERICAN arc among the most eminont scientific and practical men of the times. The editorial department is universally acknowledged to be conducted with great ability. and to be distinguished, not only for the cxcellence and truthfulness of ita discussions, but tor the fearlessness with which error is combated and false theories are exploded. Mechanics, Inventors, Engineers, Chemists, Manufacturers, Agriculturists, and people in every profeHSion of life, will find the SCIENTIFIC AMERICAN to be of great value in their respective callings. Its counsel. and suggestions will save them hundreds of dollars &nr nually. besides affording them a continual source of knowledge, the value of which is beyond pecuuialy estimate. Much might b e added t o this Prospectus, t o prove that the SCIENTIFIC AMERICAN is a publication which every Inventor, Mechanic, ArtiBan, and Engineer in the United States should patronize; but the publication is so thoroughly known throughout tho country that werefrainfrom occupying further Apace to enumerate the reMons why we should havs oDe hundred thousand subscribers instead of twenty-five thousand— which is now our eirculation—and leave the matter in the hands of each of our present subscribers to recommend its worth to a neighbor or friend, who may have been 80 unfortunate as not to have been a subscriber heretofore. TERMS OF SUBSCRIPTION—Two Dollars a Year, or One Dollar for Six Months. CLUB RATES. Five Copies, for Six Months................ 84 Ten Copies. for Six Months..............$8 Ten Copies, for Twelve Montha...........815 Fifteen Copies, for Twelve Months...... $22 Twenty Copies, for Twelve Months.......$28 For all club. of Twenty and over, the yearly subscription is only $1 40. Names can be sent in at different times and from different Post Offices. Specimen copies will be sent gratLl to any part of the country. Southern, Western and Canadian money or Post Office stamps, taken at par for subscriptions. Canadian subscribers will rleMe to remit twenty.six cents extra on \ eachyear's subscription, to pre-pay PO"tage. MUNN & CO., PubliHkr. and Fatent Agent., No. 128 Fulton Btrt, New York.