U. S. Civil Service Commission announces examination for student trainee, $3,175 and $3,415 a year (grades GS-3 and GS-4) optional fields, accounting, agricultural economics, biological and plant sciences (agronomy, biology, botany, genetics, horticulture, plant pathology, plant physiology), entomology, home economics, plant pest control, soil science (research), statistics; agricultural, general, announcement 119B.