Vol. LXIX. No. 2 AUGUST, 1906 



THE 



POPULAR SCIENCE 

 MONTHLY. 



EDITED BY J. McKEEK CATTELL 



CONTENTS 



The Investigation of the San Francisco Earthquake. G. K. Gilbert . 97 



Seismograph and Magnetograph Records of the San Francisco Earthquake. 



Dr. L. A. Bauer 116 



Reminiscences of Yukon Exploration. William Healey Dall . . . 128 



Fact and Fable in Animal Psychology. Professor Joseph Jastrow . .138 



The World State. Professor C. C. Eckhardt 147 



The Measure of Progress. Dr. Edward S. Holden 155 



The Effects of Immigration on Homicide in American Cities. Maynard 



Shipley 160 



The Study of Variable Stars. Professor Solon I. Bailey 1 76 



The Progress of Science : 



Cornell University and the Summer Meeting of the American Association ; Legislation 



Science ; Scientific Items 187 



THE SCIENCE PRESS 



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Copyright, 1906, bt THE SCIENCE PRESS 



