RATES OF ADVERTISING.

BACK PAGE - - - - 1.00 A LINE,

INSIDE PAGE - - - 75 CENTS A LINE,

_for each insertion_.

_Engravings may head advertisements at the same rate per line, by

measurement, as the letter-press_.

* * * * *

Scientific American, Volume XXIV., No. 12, March 18, 1871 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. · 第 127 / 194 题