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THE

POPULAR SCIENCE

MONTHLY.

CONDUCTED BY E. L. YOUMANS.

VOL. VI.

NOVEMBER, 1874, TO APRIL, 1875.

NEW YORK:
D. APPLETON AND COMPANY,

649 & 651 BROADWAY.

1875.

ENTERED, according to Act of Congress, in the year 1873,

By D. APPLETON & CO., In the Office of the Librarian of Congress, at Washington.

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