This page has been validated.
THE
POPULAR SCIENCE
MONTHLY
EDITED BY
J. McKEEN CATTELL
VOL. LXV
MAY TO OCTOBER, 1904
NEW YORK
THE SCIENCE PRESS
1904
THE
POPULAR SCIENCE
MONTHLY
EDITED BY
J. McKEEN CATTELL
VOL. LXV
MAY TO OCTOBER, 1904
NEW YORK
THE SCIENCE PRESS
1904