Vol. LXXni. No. 6. DECEMBER, 1908 



THE 



POPULAR SCIENCE 

 MONTHLY 



EDITED BY J. McKEEN CATTELL 

 CONTENTS 



The Cause of Pulsation. Db. Alfred Goldsbobough Mayeb .... 481 

 A Biographical History of Botany at St. Louis, Missouri. Dr. Pebley 



Spaulding 488 



The Application of Zoological Laws to Man. Professor William Kidgway 500 



Canadian Wheat. Professor John Waddell . 523 



College Standardization. Professor W. Le Conte Stevens 528 



Aspects of Modern Biology. Professor T. D. A. Cockebell .... 540 



Loyalty. Professor John C. Bbanneb 549 



The Story of Professor Rontgen's Discovery. Elmeb Ellswobth Bubns 554 

 A Great Permian Delta and its Vertebrate Life, with Restorations by the 



Author. Db. E. C. Case 557 



The Progress of Science : 



Two great University Presidents ; Scientific Items 569 



Index to Volume LXXIII 573 



THE SCIENCE PRESS 



LANCASTER, PA GARRISON, N. T. 



NEW YOEK: Sub-Station 84 



Single Number, SO Cmrra Yeably Subscription, $3.00 



Coptbight, 1908, BY THE SCIENCE PEESS 



