Entered at the Poet Office of New York N. Y. as Second Class matter. Copyrighted 1892 by Munn & Co. F$ A YEAR., scientific american, 1892-06-18

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Entered at the Poet Office of New York N. Y. as Second Class matter. Copyrighted 1892 by Munn & Co. F$ A YEAR., scientific american, 1892-06-18

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