V 



v,.i.. lvii. Nu. 6. OCTOBER, 1900. 



THE 



POPULAR SCIENCE 

 MONTHLY. 



%&r*$ t 



EDITED BT J. McKEEJf CAT TELL. 



IBRAR 



CONXENTS: 



The Address of the President before the British Association for the 



Advancement of Science, Sir William Turner 561 



The Bubonic Plague. Professor Frederick G. Novy 576 



Gasoline Automobiles. William Baxter, Jr 593 



Some Scientific Principles of Warfare. William J. Koe 605 



Modern Mongols. Dr. F. L. Oswald 618 



The Religious Beliefs of the Central Eskimo. Professor Franz Boas. 624 



Mental Energy. Edward Atkinson 632 



Chapters on the Stars. Professor Simon Newcomb, U. S. N 638 



Discussion and Correspondence : 



The Meetings of the American Association : M. E. D. Trowbrxdgje. The Color 



Red : Professor Charles E. Dana 660 



Scientific Literature : 



Mental Automatism ; The Mosquitoes of the United States gg2 



The Progress of Science : 



The British, French and German Associations for the Advancement of Science ; 

 The International Association of Academies ; The International Congresses of 

 Physics, Geology and Mathematics; James Edward Keeler ; Henry Sid g wick ; 

 Friedrich Nietzsche 664 



Index to Volume LVII 669 



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