This page has been validated.
THE
POPULAR SCIENCE
MONTHLY
EDITED BY
J. MCKEEN CATTELL
VOL. LIX
MAY TO OCTOBER, 1901
NEW YORK
THE SCIENCE PRESS
1901
THE
POPULAR SCIENCE
MONTHLY
EDITED BY
J. MCKEEN CATTELL
VOL. LIX
MAY TO OCTOBER, 1901
NEW YORK
THE SCIENCE PRESS
1901