Vol. LXVIII. No. 3 MARCH, 1906 



THE 



POPULAR SCIENCE 

 MONTHLY. 



EDITED BY J. McKEEN CATTELL 



CONTENTS 



The Physiography of the Adirondacks. Prof. James Furman Kemp, 195 



The Black Locust Tree and its Despoliation. Dr. Charles A. White. 211 



A Contribution to the Theory of Science. Prof. Wilhelm Ostwald. 219 



The Jewsharp. The late Dr. H. Carrington Bolton 239 



Geological History of Cockroaches : Dr. E. H. Sellards 244 



How Rooting Aquatic Plants influence the Nutrition of the Food 

 Fishes of Our Great Lakes. Professor Raymond Pond .... 251 



Urban and Rural Life. Frank T. Carlton 255 



Newspaper Football. Professor Edwin G. Dexter 261 



Submarine Navigation. Sir William H. White 266 



Trial and Error as a Factor in Evolution. Professor W. B. Pillsbury. 276 



The Progress of Science : 



The Kewards of Scientifio Research ; The Work of the Carnegie Institution ; 

 Professor Adolf von Baeyer ; Scientifio Items 283 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, N. T. 



NEW YORK: Sub-Station 84 

 Single Number, 30 Cents Yearly Subscription, $3.00 



CoPYBiaHT, 1906, bt THE SCIENCE PRESS 



