Vol. LXXIII. No. 5. NOVEMBER, 1908 



THE 



POPULAR SCIENCE 

 MONTHLY 



EDITED BY J. McKEEK CATTELL 



CONTENTS 



Deductions from the Records of Running in the Last Olympiad. Pro- 

 fessor A. E. Kennblly 385 



Monte Alban and Mitla as the Tourist sees them. Professor Charles 



Joseph Chamberlain 392 



The Rotation of Crops. Samuel Fraser 403 



The Public School Teacher in a Democracy. Dr. Henry R. Linville . 413 



Celibate Education To-day. E. S 423 



The Inadequacy of Speech. Dr. Chas. W. Super 429 



Zoology. Professor Henry E. Crampton 441 



Experiments with Langley's Aerodrome. The Late Dr. S. P. Langley . 462 



The Progress of Science : 



The Fiftieth Anniversary of the Announcement of the Theory of Natural Selection ; The 

 Dublin Meeting of the British Association; The Present Pandemic of the Plague; 

 Scientific Items. 475 



THE SCIENCE PRESS 



Lancaster, pa . garrison, n. t. 



NEW YOKE: Sub-Station 84 



Single Htjmbeb, 30 Cents Yearly Subscription, $3.00 



Copybight, 190S, BY THE SCIENCE PRESS 



