Vol. LXIX. No. 3 SEPTEMBER, 1906 



THE 



POPULAR SCIENCE 

 MONTHLY. 



EDITED BY J. McKEEN CATTELL 

 CONTENTS 



The Value of Science. M. H. Poincare 193 



Discontinuous Variation in Pedigree-cultures. Dr. D. T. MacDougal . 207 



America and Seismological Research. Dr. William Herbert Hobbs . 228 

 Immunity in Tuberculosis. Dr. Simon Flexner 229 



The Protection of the Alluvial Basin of the Mississippi. Robert Mar- 

 shall Brown ... 248 



The Jews, a Study of Race Environment. Maurice Fishberg .... 257 



The Development of Mechanics. Dr. S. E. Slocum 268 



Diamonds and Carbons in Brazil. H. W. Furniss 272 



Shorter Articles : 



Sigma Xi:M.B 281 



The Progress of Science : 



The Bureau of Education ; Professor Mendeleeff ; Appropriations for the Depart- 

 ment of Agriculture ; The Will of Alfred Beit ; Scientific Items 283 



THE SCIENCE PRESS 



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copykight, 1906, bt the science press 



