. Bulletin. Natural history; Natural history. 108 Illinois Natural History Survky Bulletin Vol. 27, Art. 2. â Jgj^^^^^^^^-^ M^^^0 1 P^ - ,1L - ^^^^: -r*^"^^^ Hgii «> Two members of the staff of the Illinois State Laboratory of Natural History making obser- vations on the breeding habits of fish near Havana, 1910 or 1911. The box at the stern of the boat was used by observers in watching the movements of fish and in searching for fish nests and fry. new species, and one with a new genus of plankton (Kofoid 1897, 1898, 1899). Two longer papers on plankton (Kofoid 1903, 1908), one on qua
. Bulletin. Natural history; Natural history. 108 Illinois Natural History Survky Bulletin Vol. 27, Art. 2. â Jgj^^^^^^^^-^ M^^^0 1 P^ - ,1L - ^^^^: -r*^"^^^ Hgii «> Two members of the staff of the Illinois State Laboratory of Natural History making obser- vations on the breeding habits of fish near Havana, 1910 or 1911. The box at the stern of the boat was used by observers in watching the movements of fish and in searching for fish nests and fry. new species, and one with a new genus of plankton (Kofoid 1897, 1898, 1899). Two longer papers on plankton (Kofoid 1903, 1908), one on quantitative inves- tigations and the other on constituent or- ganisms and their seasonal distribution, he wrote in California. Kofoid remained on the staff at Berkeley until his retire- ment in 1936. BOTTOM FAUNA R. E. Richardson's classic studies of the bottom fauna of the Illinois River covered a period that coincided with se- vere changes in the biologv of the river (Forbes & Richardson 1913, 1919; Rich- ardson 1921, 1925rt, 1925b, 1928). Be- fore 1900 the Illinois was a reasonably clean river receiving very limited organic pollution from a small number of towns along its banks. By 1900 Chicago had become an important trading center and was growing rapidly. In order to get rid of the sewage and the organic waste from a number of meat packing plants of Chi- cago, a diversion channel was opened be- tween Lake Michigan and the Desi Plaines River, one of the headwater! streams which united with the Kankakee to form the Illinois. Forbes and Rich- ardson had collected bottom fauna in the! Illinois prior to 1900, and Richardsoni had continued to do so after the diver- sion of Lake Michigan water had begun. At first the organic pollutants created a nuisance only in the upper part of the river, at Morris, Marseilles, and Starved Rock. Richardson studied the bottom fauna throughout the length of the upper part of the river in 1909, 1910, and 1911 and found that the river was near
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