SCIENTIFIC AMERICAN. 317 The Progress of 'Useful Science. Splendid Astronomical Instrument. Free Schools. A Great Mathematician Gone. A Great Statesman Gone. Wheat. Patent Mile Index. Sponges. Lake Superior Copper and Silver. Sudden Conversion of Iron into Steel. Schools of Design. Cheap Fare to Montreal. To New Subscribers. SCIENTIFIC AMERICAN., 1847-06-26
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