The Popular Science Monthly 



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



CONTENTS OF JANUARY NUMBER 



Some Experiments of Luther Burbank. President 

 David Starr Jordan. 



The Present Problems of Paleontology. Professor 

 Henry Fairfield Osborn. 



Social and Political Effects of Immigration. Dr. 

 Allan McLaughlin. 



Galileo. Dr. Edward S. Holden. 



Radioactivity and Matter. The late Professor Clem- 

 ens Winkler. 



Educational Problems. The Right Reverend the 

 Lord Bishop of Hereford. 



The United States Pharmacopoeia. Dr. H. C. Wood. 



The Mosquito Investigation in New Jersey. Professor 

 John B. Smith. 



The Progress of Science : 



The Presidency of the Carnegie Institution ; Con- 

 vocation Week at the University of Pennsylvania ; 

 The U. S. Department of Agriculture ; Thomas 

 Messinger Drown ; Scientific Items. 



CONTENTS OF FEBRUARY NUMBER 



Professor W. W. Camp- 



An Address on Astrophysics 



BELL. 



The Metric System of Weights and Measures, 

 fessor E. A. Kennelly. 



Pro- 



A Botanical Laboratory in the Desert. 

 Francis E. Lloyd. 



Professor 



How Immigrants Are Inspected. Dr. Allan Mc- 

 Laughlin. 



On the Relations of the Land and Fresh-Water 

 Mollusk- Fauna of Alaska aud Eastern Siberia. 

 William Healey Dall. 



Examinations, Grades and Credits. Professor J. Mc- 

 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. 



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