The Popular Science Monthly 



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



CONTENTS OF DECEMBER NUMBER 



Recent Theories in regard to the Determination of 

 Sex. Professor T. H. Morgan. 



The Academy of Science of St. Louis. Professor 

 William Trelease. 



The Tetrahedral Kites of Dr. Alexander Graham 

 Bell. Gilbert H. Grosvenor. 



Hertzian Wave Wireless Telegraphy. Dr. J. A. 

 Fleming. 



The Salmon and Salmon Streams of Alaska. Presi- 

 dent David Starr Jordan. 



The Storm Center in the Balkans. Dr. Allan Mc- 

 Laughlin. 



The Growth of Rural Population. Frank T. Gael- 

 ton. 



Rear-Admiral G. W. Melville, U. S. N., and Applied 

 Science in Construction of the New Fleet. The 

 late Professor R. H. Thurston. 



Shorter Articles and Discussion : 



An Unusual Aurora Borealis ; Jas. Lewis Howe, 

 W. C. Kendall. 



The Progress of Science : 



Robert Henry Thurston; International Educa- 

 tion; Physical and Mental Heredity; Scientific 

 Items. 



CONTENTS OF JANUARY NUMBER 



Herbert Spencer. Frontispiece. 



A Case of Automatic Drawing. Professor William 

 James. 



The College Course. Professor J. 7. Stevenson. 



The Functions of Museums. Dr. F. A. Bather. 



The Eruption of Pel6, July 9, 1902. Professor T. A. 

 Jaggar, Jr. 



Immigration and the Public Health. Dr. , Allan 

 McLaughlin. 



The Successful Women of America. Amanda Car- 

 olyn Northrop. 



Southern Agriculture, its Conditions and Needs. 

 Professor D. D. Wallace. 



Voice, Song and Speech. Dr. Wm, Scheppegrell. 



What Knowledge is of Most Worth? The late Her- 

 bert Spencer. 



The Progress of Science: 



Herbert Spencer ; The Convocation Week Meet- 

 ings of Scientific Societies ; The Carnegie Institu- 

 tion ; Botany in the Philippines; Henry Barker 

 Hill ; Scientific Items. 



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