STREAM POLLUTION 
433 
From this table the general effects of a given effluent or comparable waste on 
the aquatic complex can be predicted. By field tests at the site of pollution covering 
the critical factors as indicated for the particular effluent (dissolved oxygen, pH, 
conductivity, carbonates, and other determinations for the polluted stream as the 
case may be), the degree of pollution can be estimated when these field data are com- 
pared with the standards given in the section on stream pollutants and aquatic en- 
vironment. When specific toxic action is indicated (last section, table 14) the limits 
for the expected detrimental substances can be found in the section on lethal limits. 
ACKNOWLEDGMENTS 
The writer is particularly indebted to Dr. H. L. Motley, assistant professor of 
physiology, University of Missouri; to Dr. W. A. Chipman, assistant aquatic biolo- 
gist, United States Bureau of Fisheries; to Mrs. M. D. Ellis, honorary fellow in 
physiology, University of Missouri; to Messrs. B. A. Westfall, W. G. Davis, Paul 
Pierce, R. O. Jones; to Mrs. Helene Pierce Chipman; and to Misses Cornealia G. 
Ellis, Zella von Gremp, Nelden Bickel, and Mary McConathy, bioassayists and 
chemists, who through their cooperative efforts as members of the staff of the Colum- 
bia, Mo., field unit, United States Bureau of Fisheries, have carried forward during 
the past 4 years many analyses, assays, and experiments required to give the mass 
of data for these studies; to the officers and employees of the Corps of Engineers, 
United States Army, in various river districts, who have aided these investigations 
in moving U. S. Quarterboat 848 , and in supplying freely river and survey data from 
their own work; to the many industrial concerns which have cordially opened their 
plants and given valuable assistance in the collection of trade waste samples; and to 
the University of Missouri for continued cooperation in the maintenance of the Co- 
lumbia, Mo., laboratories. 
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