Entered at the Post Office of New York. N. Y. as Second Class Matter A A $ per Annum. Vol. XLIIINo. 15. [Now , scientific american, 1880-10-09

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Entered at the Post Office of New York. N. Y. as Second Class Matter A A $ per Annum. Vol. XLIIINo. 15. [Now , scientific american, 1880-10-09

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