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THE

POPULAR SCIENCE

MONTHLY.

CONDUCTED BY E. L. AND W. J. YOUMANS.

VOL. XXIII.

MAY TO OCTOBER, 1883.

NEW YORK:
D. APPLETON AND COMPANY,

1, 3, and 5 BOND STREET.

1883,

COPYRIGHT BY
D. APPLETON AND COMPANY,

1888.

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