J A 
CONTENTS 
Proceedings 
The Ability of Turtles to Discriminate Between 
Sounds ^ . Olive Andrews 
An Ecological Survey of Lake Butte des Morts 
Bog, Oshkosh, Wisconsin . . Olive V. Andrews 
Actual date of issue April 10, 1920. No. 3, Vol. XIII, was issued 
October 26, 1915. 
