Page:Popular Science Monthly Volume 31.djvu/7

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ESTABLISHED BY EDWARD L. YOUMANS.







THE


POPULAR SCIENCE


MONTHLY.






EDITED BY WILLIAM J. YOUMANS.




VOL. XXXI.

MAY TO OCTOBER, 1887.




NEW YORK:
D. APPLETON AND COMPANY,

1, 3, and 5 BOND STREET.
1887.