Manufacturers and Inventors 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 copious index, and from five to six hundred original engravings, together with a great amount of practical information concerning the progress of in-vontion'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 Correspondents are among the ablest practical scientific men in the world. The Patent Claims are published weekly and are invaluable to Inventors and Patentees, PRIZES—We solicit attention to the splendid Prizes offeredforthe largest number of subscribers, consisting of a SILVER PITCHER worth $60 ; a set of the MONOGRAPHIC ENCYCLOPEDIA worth $35 ; DEMPSEY'S MACHINERY OP THE NINETEENTH CENTURY, and C. B, Stuart's great work upon the NAVAL DRY DOCKS OF THE UNITED STATES. Letters should be directed (post-paid) to MUNN CO., 128 Fulton street, New York. Terms ! Terms! Terms ! One copy, for One Year $2 " Six Months $1 Five copies, for Six Mdnths $4 Ten Copies for Six Months for $8 Ten Copies for Twelve Months, $15 Fifteen Copies for Twelve Months, $J2 Twenty Copies for Twelve Months, $38 Southern and Western Money taken at par fo ! subscriptions, or Post Office Stamps taken at their ; full value,