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.
Scientific American, Vol. XXXVII.—No. 2. [New Series.], July 14, 1877 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures · 第 15 / 213 题