Vol. LXIV. No. 2 DECEMBER, 1903 



THE 



POPULAR SCIENCE 

 MONTHLY 



EDITED BY J. McKEEN CATTELL 



CONTKNTS 



Recent Theories in regard to the Determination of Sex. Professor T. 

 H. Morgan 97 



The Academy of Science of St. Louis. Professor William Trelease . 117 



The Tetrahedral Kites of Dr. Alexander Graham Bell. Gilbert H. 

 Grosvenor 131 



Hertzian Wave Wireless Telegraphy. Dr. J. A. Fleming ....'.. 152 



The Salmon acd Salmon Streams of Alaska. President David Starr 

 Jordan 165 



The Storm Center in the Balkans. Dr. Allan McLaughlin 173 



The Growth of Rural Population. Frank T. Carlton. ....... 177 



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

 struction of the New Fleet. The late Professor R. H. Thueston . 183 



Shorter Articles and Discussion : 



An Unusual Aurora Borealia : Jas. Lewis Howe, W. C. Kendall 187 



The Progress of Science : 



Eobert Henry Thurston ; International Education ; Physical and Mental Heredity ; 

 Scientific Items 189 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, N. T. 



NEW YORK : Sub-Station 84 

 Single Numbee, 30 Cents Yeaely Subscbiption, $3.00 



COPYBIQHT, 1903, BY THE SCIENCE PRESS 



