m 



Vol. LXXVIII, No. 5 MAY, 1911 



THE 



POPULAR SCIENCE 

 MONTHLY 



EDITED BY Jo McKEEJf CATTELL 



CONTENTS 



The Formation of North American Natural Bridges. Professor Herdman 

 F. Cleland 415 



Some "Weather Proverbs and their Justification. Dr. W. J. Humphreys 248 



Science at the Medieval Universities. Dr. James J. "Walsh . . .445 



■a 



The Search for the Soul in Contemporary Thought. Professor G. T. 



"W. Patrick . : 460 



Progress in Control of Plant Diseases. Dr. F. L. Stevens . . . 469 



The Services and the Rewards of the Old Greek Volunteers. Dr. Fred- 

 eric Earle "Whitaker 477 



Language and Logic. Dr. Charles "W. Super 491 



The Language of the American Indians. Dr. A. L. Kroeber . . 500 



The Progress of Science : 



Circulating Professors; The Cavendish Laboratory of Cambridge University; Scien- 

 tific Items ............ 516 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, N. Y. 



NEW YOEK : Sub-Station 84 



Single Number, 30 Cents G" Yearly Subscription, |3.00 



Copybight, 1910, by THE SCIENCE PRESS 



