LIST OF CONTRIBUTORS 



Alfred F. Bartsch, Ph.D. 



Biologist, Pacific Northwest River Basin Office, U. S. Public Health Service, Portland, 

 Ore.; formerly Senior Biologist, Wisconsin Committee on Water Pollution, State Board 



of Health, Madison, Wis. 



Margaret P. Briggs, M.A. 



Graduate Student, Department of Agricultural Bacteriology, University of Wisconsin, 



Madison, Wis. 



Cornelia L. Carey, Ph.D. 

 Associate Professor of Botany, Barnard College, New York, N. Y. 



Shih L. Chang, M.D. 



Assistant Professor of Sanitary Biology, Department of Sanitary Engineering, Graduate 

 School of Engineering and School of Public Health, Harvard University, Cambridge, 



Mass. 



Warren S. Churchill, M.A. 



Biologist, Wisconsin Conservation Department, Northeast Fishery Area Headquarters, 



Woodruff, Wis. 



BosTwicK H. Ketchum, Ph.D. 

 Marine Microbiologist, Woods Hole Oceanographic Institution, Woods Hole, Mass. 



James B. Lackey, Ph.D. 

 Editor, The Blakiston Company, Philadelphia, Pa. 



John B. Moyle, Ph.D. 



Aquatic Biologist, Fisheries Research Unit, Minnesota Department of Conservation, 



St. Paul, Minn. 



Theodore A. Olson, A.M. 



Associate Professor, School of Public Health, University of Minnesota, Minneapolis, 



Minn. 



Clarence E. Taft, Ph.D. 

 Associate Professor of Botany, The Ohio State University, Columbus, Ohio. 



Willis M. Van Horn, Ph.D. 

 Research Associate, The Institute of Paper Chemistry, Appleton, Wis. 



John N. Wilson, M.A. 



Associate Public Health Biologist, Minnesota Department of Health, Minneapolis, 



Minn. 



