Page 



Pollution between Stations 117 and 25U 286 



Pollution inshore 286 



Pollution offshore 28? 



Summary statement regarding pollution in the River 



Raisin Section 289 



Detroit River Section 291 



Regular stations 291 



Pollution in the Detroit River Section 293 



Summary statement regarding pollution in the Detroit 



River Section 298 



Areas of the zones of pollution 299 



Effects of polluti on on the fishery 299 



General statement 299 



Chemistry 301 



Bacterial pollution 30U 



Pollution of the bo ttom 305 



The plankton 309 



Conclusion 310 



Bibliography 311 



ILLUSTRATIONS 

 Figure Page 



1. Western Lake Erie, showing sections and principal stations 21 



2. Lake Erie 25. 



3. Western Lake Erie showing principal hydrographic features 27 



U. Islands, shoals and reefs in the eastern part of './estern Lake 



Erie 30 



$. Averages of monthly mean lake levels at Cleveland, Ohio for the 



period 1860-1930 3U 



6. Courses taken try drift-bottles, 1928 UO 



7. Progressive change in temperature conditions at Station 37A 



over a period of 3 months in 1930 5l 



8. Comparison of mean water temperatures at Station 158 in 1929 



and 1930 53 



9. Comparison of mean v;ater temperatures at Station 3F in 1929 



and 1930 ". 5U 



10. Comparison of the mean water temperatures at Stations l58 



and 37A, 1930 56 



11. Dissolved oxygen, free carbon dioxide, methyl orange alkalinity 



and pH of the surface water at Station 37A, 1929 65 



12. Dissolved oxygen, free carbon dioxide, methyl orange alkalinitj'- 



and pH of the surface water at Station 37A, 1930 7h 



