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THE
POPULAR SCIENCE
MONTHLY.
EDITED BY WILLIAM JAY YOUMANS.
VOL. XL.
NOVEMBER, 1891, TO APRIL, 1892.
NEW YORK:
D. APPLETON AND COMPANY,
1, 3, AND 5 BOND STREET.
1892.
75,439
COPYRIGHT, 1892,
BY D. APPLETON AND COMPANY.