The Popular Science Monthly 



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



CONTENTS OF THE MARCH NUMBER 



Glimpses of the Great American Desert. Professor 

 Raymond!. Pool. 



A New Development in the Mississippi Delta. Pro- 

 fessor E. W. Hilgard. 



The Imperial Universities of Japan. H. Foster Bain. 



Efficiency Wage Standards. Professor Scott Nearing. 



The Instinctive Element in Human Society. Profes- 

 sor Charles A. Ell wood. 



Types of Men. Professor S. N. Patten. 



Time and Space. Dr. Charles W. Super. 



Professional Training for Child Hygiene. Professor 

 Lewis M. Terman. 



The Four Periods in the Development of the Modem 

 Zoological System. Professor H. S. Pratt. 



Florentino Ameghino. Dr. W. D. Mathew. 



The Progress of Science : 



Ten Years of the Carnegie Institution; Lord 



Lister ; Scientific Items. 



CONTENTS OF THE APRIL NUMBER 



On the Need of Administrative Changes in the Ameri- 

 can University. Professor George T. Ladd. 



Science in the Service of Highway Construction. Dr. 

 Clifford Richardson. 



The Brooklyn Botanic Garden. Dr. C. Stuart Gager. 



Alexander von Humboldt. Dr. Edward F. Williams. 



A Review of Three Famous Attacks upon the Study 

 of Mathematics as a Training of the Mind. Pro- 

 fessor Florian Cajori. 



The Red Sunflower. Professor T. D. A. Cockerell. 



The Medical Side of Immigration. Dr. Alfred G . Reed. 



Ancient Portals of the Earth. Professor James Perrin 

 Smith. 



Ptomaines and Ptomaine Poisoning. Dr. Edwin 



LeFevre. 

 Science and International Good Will. J. McKeen 



Cattell. 

 The Progress of Science : 



The Rockefeller Institute for Medical Research ; 



Exploration and Adventure in the Antarctic; 



Scientiflc Items. 



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



SUBSCRIPTION ORDER 



To THE SCIEJ^CE PRESS, 



Publishers of THE POPULAR SCIENCE MOJ{THLY, 

 Sub-Station 84-, Jfew York City. 



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

 tion to THE POPULAR SCIEjYCE MOJfTHLT for one year, beginning 

 May, 1912. 



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

 risk), subscription for six months to THE POPULAR SCIEJYCE 

 MOJfTHLT, beginning May, 1912. 



Kame -• 



Address- 



Single Numbers 30 Cents Yearly Subscription, $3.00 



THE SCIENCE PRESS 



Garrison-on-Hudson. N. Y. 



41 North Queen St.. Lancaster. Pa. 



Sub-Station 84; NEW YORK 



PRKms OF THE NSW Era Printing Company 



