Vol. LXV. No. 6 OCTOBER, 1904 



THE 



POPULAR SCIENCE 

 MONTHLY. 



EDITED BY J. McKEEN CATTELL 

 CONTENTS 



The Right Honorable Arthur James Balfour Frontispiece 



A Traveler's View of the British Association Meeting. President 

 Henry S. Pritchett 483 



Reflections suggested by the New Theory of Matter. The Right Hon- 

 orable Arthur James Balfour 495 



The Mathematical Physics of the Nineteenth Century. Professor 



Horace Lamb 507 



Heredity and Evolution. "William Bateson 522 



On the Perception of the Force of Gravity by Plants. Professor Fran- 

 cis Darwin 532 



The Ethnological Work of Lane Fox. Henry Balfour 537 



On Mountains and Mankind. Douglas W. Freshfield 543 



Correlation of Reflexes and the Principle of the Common Path. Pro- 

 fessor C. S. Sherrington 549 



Invention and Discovery. The Hon. Charles A. Parsons ..... 553 

 The Progress of Science : 



The Cambridge Meeting of the British Association for the Advancement of Science; 



The Address of the President ; The Work of the Sections 560 



Index to Volume LXV. 573 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, if. Y. 



NEW YORK : Sub-Station 84 

 Single Number, 30 Cents Yearly Subscription, $3.00 



Copyright, 1904, by THE SCIENCE PRESS 



