BULLETIN 
OF THE 
ILLINOIS STATE LABORATORY 
OF 
NATURAL HISTORY 
URBANA, ILuinors, VU. S. A. 



Wow. VII. ARTICLE I, 

THE PLANKTON OF THE ILLINOIS RIVER, 1894-1899, WITH 
INTRODUCTORY NOTES UPON THE HYDROGRAPHY OF THE ILLINOIS 
RIVER AND ITS BASIN. PART II. CONSTITUENT ORGANISMS AND 
THEIR SEASONAL DISTRIBUTION. 
By) 
CA KOrROED, Pu. 
