Vol. V 



March, 1918 



INDIANA UNIVERSITY 

 STUDIES 



Study No. 36 



AN EXPERIMENT TO TEST THE NATURE OF THE VARI- 

 ATIONS ON WHICH SELECTION- ACTS. ^ By Fernandus 

 Payne, Ph.D., Associate Professor of Zoology, iBdiana Uni- 

 versity. 



For Sale by the University Bookstore, Bloomington, Ind. Price, 23 cents. 



