BUELETIN 
OF THE 
ILLINOIS STATE LABORATORY 
OF 
NATURAL HISTORY 
Ursana, ILuinots. U.S.A. 
Wioits WAL NOVEMBER, 1903 ARTICLE II. 
* THE PLANKTON OF THE ILLINOIS RIVER, 1894-1899, WIE IN = 
TRODUCTORY NOTES UPON THE HYDROGRAPHY OF THE ILLINOIS 
RIVER AND ITS BASIN. PARTI. QUANTITATIVE INVESTIGATIONS AND 
GENERAL RESULTS. 
BY 
CA COEOID PAD. 
