628 



Plate XXVIII. 



The same for 1897. 



Plate XXIX. 

 The same for 1898-1899. 



Plate XXX 



Seasonal distribution of plankton in Dogfish Lake in 1895. Hydrograph from 

 Jan. 1 to Aug. 8 is that of the Illinois River at Copperas Creek, and thereafter, at 

 Havana. 



Plate XXXI. 



The same for 1896. Hydrograph is that of the Illinois River at Havana. 



Plate XXXII. 

 The same for 1897. 



Plate XXXIII. 



The same for Flag Lake (Station K) for 1895-1896. 



Plate XXXIV. 



The same for 1897-1898. 



Plate XXXV. 



Seasonal distribution of plankton in Thompson's Lake (Station G) in 1894. 

 Hydrograph is that of the Illinois River at Copperas Creek. 



Plate XXXVI. 



The same for 1895. Hydrograph from Jan. 1 to Aug. 8 is that of the Illinois 

 River at Copperas Creek, and thereafter, at Havana. 



Plate XXXVII. 

 The same for 1896. Hydrograph is that of the Illinois River at Havana. 



Plate XXXVIII. 

 The same for 1897. 



Plate XXXIX. 



The same for 1898- 1899. 



Plate XL. 

 The same for Phelps Lake in 1896. 



Plate XLI. 



The same for 1897. 



Plate XLI I. 



The same for 1898-1899. 



