Section 1. That the County Board of School Trustees in counties having a population of 37,000 to 37,800, according to the Federal census of 1920, and a scholastic population of at least 10,000 as shown by the scholastic report for the school year 1927-28, may employ a Rural School Supervisor to plan, outline, and supervise the work of the primary and intermediate grades of the rural schools of the county.