The Popular Science Monthly 



Entered in the Pott Office in Lancaster, Pa., as second-class matter. 



CONTENTS OF OCTOBER NUMBER 



The Right Honorable Arthur James Balfour 



Frontispiece. 



A Traveler's View of the British Association Meeting. 

 President Henry S. Pritchett. 



Reflections suggested by the New Theory of Matter. 

 The Right Honorable Arthur James Balfour. 



The Mathematical Physics of the Ninteenth Century. 

 Professor Horace Lamb. 



Heredity and Evolution. William Bateson. 



On the Perception of the Force of Gravity by Plants. 

 Professor Francis Darwin. 



Henry 

 Douglas W. Fresh- 



The Ethnological Work of Lane Fox 

 Balfour. 



On Mountains and Mankind. 

 field. 



Correlation of Reflexes and the Principle of the 

 Common Path. Professor C. S. Sherrington. 



Invention and Discovery. The Hon. Charles A. 

 Parsons. 



The Progress of Science: 



The Cambridge Meetine of the British Associa- 

 tion for the Advancement of Science; The Ad- 

 dress of the President; The Work of the Sections. 



CONTENTS OF NOVEMBER NUMBER 



The International Congress of Arts and Science. 

 Wm. Harper Davis. 



Illustrated with portraits of Waldeyer, Picard, 

 Moore, Maschke, Clarke, Jordan, Osborn, Scott, 

 Woodward, Rotch, Arrhenius, Ostwald, Boltziuann, 

 Loeb, Hoffding, Ward, Mitsukuri, Wiesner, Miinster- 

 berg and other speakers and officers of the Congress. 



Addresses given at the International Congress of 

 Arts and Science : 



Sir 



Present Problems of Inorganic Chemistry. 

 William Ramsay. 



The Light of the Stars. Professor E. C. Picker- 

 ing. 



The Fundamental Concepts of Physical Science. 

 Professor Edwabu L. Nichols 



The Methods of the Earth Sciences, 

 T. C. Chambeki.in. 



Professor 

 President David Starr 



Utilitarian Science. 

 Jordan. 



The Evolution of the Scientific Investigator. 

 Profes.-or Simon Newcomb. 



The Progress of Science ; 



The International Congress of Arts and Science ; 

 Tje Louisiana Purchase Exposition. 



The MONTHLY will be sent to new subscribers for six months for One Dollar 

 SUBSCRIPTION ORDER 



To THE SCIENCE PRESS, 



Publishers of THE POPULAR SCIENCE MONTHLY, 

 Sub-Station 8Jf, New York City. 



Please find enclosed check or money order for three dollars, subscrip- 

 tion to THE POPULAR SCIENCE MONTHLY for one year, begin- 

 ning December, 1904- 



Please find enclosed from a new subscriber one dollar (sent at- your 

 risk), subscription for six months to THE POPULAR SCIENCE 

 MONTHLY, beginning December, 190 4. 



Name 



Address. 



Single Numbers 30 Cents Yearly Subscription, $3.00 



THE SCIENCE PRESS 



GARRISON-ON-HUDSON, N. Y. 41 NORTH QUEEN ST., LAN CASTER, PA. 



Sub-Station 84: NEW YORK 



pR«sa of Tut hbw l*> Printing company 



