BULLETIN OF THE STATE UNIVERSITY OF IOWA 

 NEW SERIES No. 35 OCTOBER. 1911 



BULLETIN 



FROM THE 



LABORATORIES OF NATURAL HISTORY 



OF 



THE STATE UNIVERSITY OF IOWA 



VOLUME VI NO. 2 



PUBLISHED BY THE UNIVERSITY 

 IOWA CITY, IOWA 



issvED Twekty-One Timks DuEisa THE Academic Year; Monthlt From October to 



.January, Weekly From FEBErARY to June. Entered at the 



Post Office as Second Class Mail Matter 



