COMMUNICATIONS RECEIVED.
Liniment. By J. L. T.
Seen and Tangible and the Unseen and Intangible. By J.L.T.
On Cheap Railroads. By R. P. N.
On a Meteor. By W. E. C.
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[OFFICIAL.]
Scientific American, Volume XLIII., No. 25, December 18, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. · 第 69 / 165 题