^uron, by dichlorobenzol, and its ef :"ect on the fishes of the bay. Lake 

 ^Iichif;an has been studied in some detail, particularly in the vicinity of 

 Chicago. Perhoas the most c^m' lete studj'- of this kind was reported for 

 :,he lake water at Chica^p by Palmer (1903). Somehwat less coinplete data for 

 ^ther points in the southern part of the lake are given by Bartow (1909 and 

 L909a) and Barnard and Brewster (I909) . More recent investigations in this 

 area, such as those reported by the Chicago Sanitary District, Engineering 

 3oard of Review (1925a) and Crohurst and Veldee (1927), have been restricted 

 iio determinations of dissolved oxygen and biochemical oxygen demand. There 

 :iave been no chemical studies of Green Bay, but the vfi-sconsin State Board of 

 iealth (1927) has reported on an extensive investigation of the lower part 

 )f Fox River to the point where it empties into the bay. In their study of 

 :he forms of nitrogen in lake waters, Domogalla and his associates made a few 

 inalyses of the water of Lake Michigan. The data will be found in the follow- 

 .ng papers listed in the bibliography: Domogalla, Juday, and Peterson (192$), 

 'eterson, Fred, and Domogalla (1925), and Domogalla, Fred, and Peterson (I926) . 



Only a few sanitary analyses for Lake Ontario have been reported, 

 joodwin (1892) made a brief study of the water supply of Kingston, Ontario, 

 ind Whipple (1913) analysed a few samples from the lake near the mouth of 

 lenesee River. A recent report by Faigenbaum (1932) contains a large number 

 )f data on dissolved oxygen, carbon dioxide, and pH of Black River '^ay and 

 ind of tributaries to this bay and St. Lawrence River. 



Lake Erie has been studied more extensively than the other lakes of the 

 3ystem. The Ohio State Board of Health (1899) made a large number of sanitary 

 inalyses in Sandusky and Maumee Rivers, and later (1902) reported on the water 

 supplies of several cities along the lake shore. The Detroit Board of Health 

 (1902) published the results of a study of Detroit River water over a period 

 )f a year. A two-year investigation of the lake water at Cleveland was 

 ireported by Jackson (1912) . Donaldson and Furman (192 7) studies the phenol 

 wastes in Maumee River and in the lake at the extreme west end. Reports on 

 tihe mineral constituents by Dole (1909), Clarke (192U) , Foulk (1925), Detroit 

 Department of Water Supply (1930), and McNamee (1930) have been mentioned 

 :)reviously. The last two reports concern some of the tributaries at the west 

 ?nd of the lake. 



In recent years there have been a number of studies of the cherdstry 

 )f the lake with a view of determining its suitability for aquatic organisms, 

 particularly fishes. In 1920 and 1921 Professor Jacob E. Reighard supervised 

 1 detailed pollutional study of the lower part of River Raisin. The results 

 )f this study have not been published, but Professor Reighard has generously 

 Dlaced his manuscript at the writer's disposal. Certain of the data on dis- 

 solved oxygen in the river and in Lake Erie nearby will be introduced in 

 Later pages of this report. Osbum (1926 and 1926a) reported the oxygen con- 

 sent and pH at a number of points at the west end of the lake and along the 

 Jouth shore. In 1928 the lake east of Long Point was studied in some detail 

 oy several co-operating agencies. Wagner (1929) reported on the waters along 

 ihe south shore and on a number of tributary streams in that region. Williams 

 [1929) and Biirkholder (1929) discussed the chemistry of the open lake with 



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