Vol. LXIV. No. 4 FEBRUARY, 1904 



THE 



POPULAR SCIENCE 

 MONTHLY 



EDITED BY J. McKEEJ^ CAT TELL 



CONTKNTS 



Professor W. G. Farlow Frontispiece. 



Scientific Investigation and Progress. President Iea Remsen . . ; 291 



Comrades in Zeal. President David Starr Jordan 304 



The Predecessors of C^opernicus. Dr. Edward S. Holden 316 



The Conservation of Energy in those of Advancing Years. Dr. J. 

 Madison Taylor 343 



The Geographical Distribution of Meteorities. Dr. Oliver C. Far- 



RINGTON 351 



Washington University. Charles P. Pettus 355 



What is Group Theory ? Professor G. A. Miller . ... . . .369 



The Progress of Science : 



Convocation Week Meetings of Scientific Societies ; The St. Louis Exposition 

 and its Congress of Arts and Science ; The Scientific Basis of Cheese-Making ; 

 Scientific Items 375 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, N. Y. 



NEW YORK : Sub-Station 84 

 Single Number, 30 Cents - Ykably Subscbiption, $3.00 



cofyeiqht, 1604, by the scienck press 



