TERMS FOR THE SCIENTIFIC AMERICAN.
| One copy, one year, postage included | $3 20 |
| One copy, six months, postage included | 1 60 |
Clubs.—One extra copy of The Scientific American will be supplied gratis for every club of five subscribers at $3.20 each; additional copies at same proportionate rate. Postage prepaid.
Remit by postal order. Address MUNN & CO., 37 Park Row, New York.
To Advertisers.—The regular circulation of the Scientific American is now Fifty Thousand Copies weekly. For 1880 the publishers anticipate a still larger circulation.