A new Volume of the SCIENTIFIC AMERICAN commences about the middle of September in each year. It is a journal of Scientific, Mechanical, and other improvements; the advocate of industry in all its various branches. It is published weekly in a form suitable for binding, and constitutes, at the end of each year, a splendid volume of over 400 pages, with a oopious index, and from flv to six hundred original engravings, together with a great amount of practical information concerning the program of invention and discovery throughout the world. The Scientific American is the most widely circulated and popular journal of the kind now published. Its Editors, Contributors, and Correspondent are among the ablest practical scientific men in the world. The Patent Claims are published weekly and are invaluable to Inventors and Patentees. We particularly warn the publio against paying money to Travelling Agents, as we are not in the habit of furnishing certificates of agency to any one. Letters should be directed (post-paid) to MUNN& CO., 128 Fnlton street, New Totk. Terms ! Terms! Terms ! One oopy, for One Tear $2 " Six Months $1 live oopies, for Six Months $1 Ten Copies for Six Months for $8 Ten Copies for Twelve Months, $15 fifteen Copiesfor Twelve Months, $22 Twenty Copies for Twelve Months, $28 Southern and Western Money taken at par for inscriptions, oi Post Offioe Stampa taken at thtir fall value.