BULLETIN OF THE STATE UNIVERSITY OF IOWA 

 NEW SERIES No. 28 MAY 13, 1911 



BULLETIN 



FROM THE 



LABORATORIES OF NATURAL HISTORY 



or 



THE STATE UNIVERSITY OF IOWA 



VOLUME VI NO. 1 



PUBLISHED BY THE UNIVERSITY 



IssuKD Twentt-Onk Tutes Dxtbtko the Academic Teae; Monthly Feom Octobkb 



TO JAXtARY, Weekly from February to JrxE. Entered at the Post 



Office in Iowa City as second Class Mail Matter 



