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THE
POPULAR SCIENCE
MONTHLY.
CONDUCTED BY E. L. AND W. J. YOUMANS.
VOL. XV.
MAY TO OCTOBER, 1879
NEW YORK:
D. APPLETON AND COMPANY,
549 & 551 BROADWAY.
1879.
THE
POPULAR SCIENCE
MONTHLY.
CONDUCTED BY E. L. AND W. J. YOUMANS.
VOL. XV.
MAY TO OCTOBER, 1879
NEW YORK:
D. APPLETON AND COMPANY,
549 & 551 BROADWAY.
1879.