The Popular Science Monthly 



Entered in the Post Office in Lancaster, Pa., as second-class matter. 



CONTENT8 OF THE MAY NUMBER 



The Formation of North American Natural Bridges- 

 Professor Hekdman F. Cleland. 



Some Weather Proverbs and their Justification. Dr. 

 W. J. Humphreys. 



Science at the Medieval Universities. Dr. Jambs J. 

 Walsh. 



The Search for the Soul in Contemporary Thought. 

 Professor G. T. W. Patrick. 



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

 Stevens. 



The Services and the Rewards of the Old Greek Vol. 

 unteers. Dr. Frederic Earle Whitakkr. 



Language and Logic. Dr. Charles W. Super. 



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

 Kroeber. 



The Progress of Science : 



Circulating Professors; The Cavendish Labora- 

 tory of Cambridge University ; S«ientific Items. 



CONTENT8 OF THE JUNE NUMBER 



The Measurement of Natural Selection. Dr. J. Arthub 



Harris. 

 The Relation of Biology to Agriculture. Professor F. 



R. Marshall. 

 Is Euclid's Geometry Merely a Theory. Dr. Edward 



Moffat Weyer. 

 The Underlying Facts of Science. Alfred Sang. 

 The Vienna Institution for Experimental Biology. 



Pro£ Charles Lincoln Edwards. 

 The Relation of the Manual Arts to Health. Professor 



Lewis M. Terman. 

 What Masterpieces of Greek Sculpture were known to 



the Men of the Renaissance? Dr. Edward S. 



Holden. 

 The Progress of Science : Meetings of Scientific Soci- 

 eties ; The Centenary of the Birth of John William 



Draper ; Henry Nathaniel Bowditch ; Scientific 



Items. 

 Index to Volume LXXVLTC. 



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