Address of the President Before the British Association 561
The Bubonic Plague 576
Gasoline Automobiles 593
Some Scientific Principles of Warfare 605
Modern Mongols 618
Religious Beliefs of the Central Eskimo 624
Mental Energy 632
Chapters on the Stars 638
Discussion and Correspondence 660
Scientific Literature 662
The Progress of Science 664
Index 669
THE
POPULAR SCIENCE
MONTHLY
EDITED BY
J. McKEEN CATTELL