THE

POPULAR SCIENCE

MONTHLY.

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

VOL. XXIX.

MAY TO OCTOBER, 1886.

NEW YORK:

D. APPLETON AND COMPANY,

1, 3, AND 5 BOND STREET.

1886.

LIBR

MAY

12

1007

24301-

COPYRIGHT, 1886,

BY D. APPLETON AND COMPANY.

THE