Vol. LXIX. No. a DECEMBER, 1906 



THE 



POPULAR SCIENCE 

 MONTHLY. 



EDITED BY J. McKEEN CATTELL 

 CONTKNTS 



The Bogoslofs : President David Starr Jordan and George Archibald 



Clark 481 



The Development of the Telephone Service. Fred DeLand 490 



The Jews : a Study of Race and Environment. Dr. Maurice Fishberg . 502 



Physical Degeneracy or Race Suicide ? Sidney Webb 512 



Waterway Defences of the Atlantic Coast. William J. Roe .... 530 



The Simplification of French Spelling. Professor Brander Matthews . 539 



The Value of Science. Professor H. Poincar^ 545 



Vesuvius in the Early Middle Ages : Dr. Charles R. Eastman ... . 558 



The Progress of Science : 



The New Engineering Building of the University of Pennsylvana ; The Harveian Ora- 

 tion, Scientific Items 567 



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