On January 24, 1978, four USDA agencies—Agricultural Research 
Services (ARS), Cooperative State Research Service (CSRS), Exten- 
sion Service (ES), and the National Agricultural Library (NAL)— 
merged to become a new organization, the Science and Education 
Administration (SEA), U.S. Department of Agriculture. 
This publication was prepared by the Science and Education Ad- 
ministration’s Agricultural Research staff, which was formerly the 
Agricultural Research Service. 
Revised December 1978 
For sale by the Superintendent of Documents, U.S. Government Printing Office 
Washington, D.C. 20402 
Stock Number 001-000-03835-4 
