Xlll 



PAGE 



Plankton production 342 



In 1 896 342 



In 1897 343 



Causes of the large autumnal production 345 



In 1898-99 347 



Summary 349 



Quiver Lake, Station C 350 



Environmental conditions 350 



Collections 352 



Plankton production 353 



In 1894 353 



In 1895 354 



In 1896 356 



Comparison of plankton pulses with those of river 356 



Cause of increased production 359 



In 1897 361 



In 1898 363 



In 1899 366 



Dogfish Lake, Station L 367 



Environmental conditions 367 



Collections 368 



Plankton production 369 



In 1895 369 



In 1896 371 



The vernal pulse ; cause of acceleration 372 



Similarity of course of production to that of Quiver Lake 372 



Relation of local factors to dissimilarities 374 



Effect of high water on production 377 



Comparison with Quiver Lake 377 



In 1897 378 



Summary of relations of Quiver and Dogfish lakes to the Illinois River. 379 



Impounding function of lakes 379 



Effect of vegetation 379 



Similarity of movement in production in lakes and river 380 



Flag Lake, Station K 381 



Environmental conditions 3^1 



Collections 3^3 



Plankton production 3^4 



In 1895 384 



In 1896 385 



Hydrographic conditions 386 



Contributions to the river 386 



Similarity to other stations in movement of production 387 



Sudden decline from vernal pulse 388 



In 1897 389 



In 1898. 391 



Summary 39^ 



