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THE
POPULAR SCIENCE
MONTHLY.
CONDUCTED BY E. L. AND W. J. YOUMANS.
VOL. XII.
NOVEMBER, 1877, TO APRIL, 1878.
NEW YORK:
D. APPLETON AND COMPANY,
549 & 551 BROADWAY.
1878.
THE
POPULAR SCIENCE
MONTHLY.
CONDUCTED BY E. L. AND W. J. YOUMANS.
VOL. XII.
NOVEMBER, 1877, TO APRIL, 1878.
NEW YORK:
D. APPLETON AND COMPANY,
549 & 551 BROADWAY.
1878.