Lb 



The Third Yearbook 



OF THE 



NATIONAL SOCIETY FOR THE SCIEN 

 TIFIC STUDY OF EDUCATION 



Part II 

 NATURE-STUDY 



BY 



Wilbur S. Jackman 



The University of Chicago 



EDITED BY 



MANFRED J. HOLMES 



MEETINGS FOR THE DISCUSSION OF THIS PAPER WILL BE HELD AT 4:00 P. M. 



MONDAY, JUNE 27, AND AT 4:30 P. M., TUESDAY, JUNE 28, I9O4, 



ROOM I, HALL OF CONGRESSES, WORLD'S 



FAIR GROUNDS, ST. LOUIS 



CHICAGO 



THE UNIVERSITY OF CHICAGO PRESS 



1904 



