Vol. LXXIX, No. S. SEPTEMBER,; 1911 



THE 



POPULAR SCIENCE 

 MONTHLY 



EDITED BY Jo MoKEEK CATTELL 



CONTENTS 



The Bureau of Standards. Professor Henry S. Carhart. . . . 209 



On the History of Internal Medicine. Dr. John Benjamin Nichols. . 220 



Science and Social Progress. Dr. Frederick A. Bushee. . . . 236 



Attempts to explain Gravitation. Wilson C. Morris 252 



The Purpose and Some Principles of Systematic Zoology. Hubert Lyman 

 Clark 261 



The Narrowing Circle of the Animal Kingdom. Thos. D. Eason. . . 272 



Food Preparation and its Relation to the Development of Efficient Person- 

 ality in the Home. Laura Clarke Rockwood. . . . 277 



The Constitutional Conservatism of Women. Dr. Otto Charles Glaser. 299 



Floating Islands. Sidney Powers. . 303 



The Progress of Science : 



Charles Otis Whitman ; The American Geographical Sooiety ; Soientifio Items. . 308 



THE SCIENCE PRESS 



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NEW YOKE : Sub-Station 84 

 Single Number, 30 Cents Yearly Subscription, $3.00 



COFTBIGHT, 1910, by THE SCIENCE PRESS 



