Vol. LXVIII. No. 4 APRIL, 1906 



THE 



POPULAR SCIENCE 

 MONTHLY. 



EDITED BY J. McKEEjY CATTELL 

 CONTENTS 



Samuel Pierpont Langley Frontispiece 



The Queen Ant as a Psychological Study. Dr. William Morton 



Wheeler 291 



The Development of the Glacial Hypothesis in America. Dr. George 



P. Merrill 300 



The Earliest Predecessors of Copernicus. Dr. Charles R. Eastman . 323 



The Greatest Need in Research. Professor M. V. O'Shea .... 328 



Making Geography While You Wait. Thomas H. Macbrlde . . 333 



Extra Digits and Digital Reductions. Dr. Charles W. Prentiss . . 336 



A Sanitary Outlook. Sir James Crichton-Brown 349 



Shorter Articles : 



The Yellow Fin Albacore : President David Stare Jordan 376 



The Progress of Science : 



Samuel Pierpont Langley ; The Solar Observatory of the Carnegie Institution ; 

 The Warren Museum of Natural History ; The New Zoological Museum and Lab- 

 oratories of the University of Liverpool ; Scientific Items 377 



— 



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copyeioht, 1906, bt the science press 



