The Popular Science Monthly 



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



CONTENTS OF FEBRUARY NUMBER 



An Address on Astrophysics. Professor W. W.Camp- 

 bell. 



The Metric System of Weights and Measures. Pro- 

 fessor E. A. Kennelly. 



A Botanical Laboratory in the Desert. Professor 

 Fkancis E. Lloyd. 



How Immigrants Are Inspected. Dr. Allan Mc- 

 Laughlin. 



On the Relations of the Land and Fresh-Water 

 Mollusk-Fauna of Alaska and Eastern Siberia. 

 William Healey Dall. 



Examinations, Grades and Credits. Professor J. Mo 

 Keen Cattell. 



Shorter Articles and Correspondence : 



De Morgan and Characteristic Curves of Compo- 

 sition. Dr. T. C. Mendenhall. 



The Progress of Science : 



Convocation Week in Philadelphia ; The Ameri- 

 can Association; The Presidential Address; Af- 

 filiated Societies ; Scientific Items. 



CONTENTS OF MARCH NUMBER 



The Bermuda Islands and the Bermuda Biological 



Station for Research. Professor Edward L. 



Mare. 

 A Study of the Development of Geometric Methods. 



M. Gaston Darboux. 

 Some Present Problems in Technical Chemistry. 



Professor W. H. Walker. 



Stamina. Dr. A. N. Bell. 



The Natural History of Adolescence. Professor 

 Joseph Jastrow. 



Higher Education of Women and Race Suicide. By 

 A. Lapthorn Smith. 



Simple Bacteriology for the Public Schools. Lillian 

 Chapin. 



Shorter Articles and Correspondence : 



The Centennial of William Barton Rogers: Presi- 

 dent Henry S. Pritchett. The Inland White 

 Bear, Dr. W. J. Holland. 



The Progress of Science ; 



The Carnegie Institution of Washington; Clem- 

 ens Alexander Winkler; Greek and the English 

 Universities; Scientific Items. 



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