THE

POPULAR SCIENCE

MONTHLY.

EDITED BY WILLIAM J. YOUMANS.

VOL. XXXIV.

NOVEMBER, 1888, TO APRIL, 1889.

NEW YORK:
D. APPLETON AND COMPANY,

1, 3, AND 5 BOND STREET.

1889.

L. SOC. 120.46

COPYRIGHT, 1889,

BY D. APPLETON AND COMPANY.