UNITED STATES DEPARTMENT OF THE INTERIOR 



Stewart L. Udall, Secretary 



James K. Carr, Under Secretary 



Frank P. Briggs, Assistant Secretary jor Fish and Wildlife 



FISH AND WILDLIFE SERVICE, Clarence F. Pautzke, Commissioner 



Bureau of Commercial Fisheries, Donald L. McKernan, Director 



USE OF PLANT EXTRACTS IN SEROLOGICAL 



STUDIES OF FISH 



by 



Fred M. Utter, George J. Ridgway, and 

 Harold O. Hodgins 



United States Fish and Wildlife Service 

 Special Scientific Report--Fisheries No. 472 



Washington, D.C. 

 February 1964 



