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THE
POPULAR SCIENCE
MONTHLY
EDITED BY
J. McKEEN CATTELL
VOL. LXXXVII
JULY TO SEPTEMBER, 1914
NEW YORK
THE SCIENCE PRESS
1915
THE
POPULAR SCIENCE
MONTHLY
EDITED BY
J. McKEEN CATTELL
VOL. LXXXVII
JULY TO SEPTEMBER, 1914
NEW YORK
THE SCIENCE PRESS
1915