Increased population brought increased needs for various new public services. Shortly after the first State Board of Health was established in Virginia in 1900, the counties of the State established local boards. The Chairman of the Board of County Supervisors automatically became Chairman of the Health Board in this early experiment in public health services.[117] The machinery for raising revenue was made more efficient by redrawing the division of labor between the commissioner of revenue and the county treasurer. Most far-reaching in the long run, however, was the enactment in 1920 of state legislation giving counties the option of adopting various managerial forms of government if they so desired. Fairfax County exercised this option in 1951 by adopting the County Executive form of government.[118] Under this form of county government, the Board of Supervisors remained the sole legislative authority of the County, but the executive functions were placed under the supervision of a new officer, the county executive. The county executive, as well as all boards and commissions responsible for special services and administrative functions, were appointed by the Board of Supervisors, and served either for specified terms or at the pleasure of the Board. The Supervisors continued to be elected by the County's voters, each from one of the magisterial districts. This method of election was adopted deliberately as a means of maintaining a balance of political representation of the western and southern parts of the County, which still were rural in their economic and social orientation, and the north, east and central areas of the County, which had been intensively developed as part of the suburbs of Washington and Alexandria. The involvement of the public in county government was seen in many forms. Service on county boards and commissions was one. Also, as newcomers poured into the county seeking homes, the neighborhoods and communities formed civic organizations or citizens associations to provide means for group action on problems of common concern. Parallel to these groups, others, such as Parent-Teachers Associations, formed to deal with school-related problems which were both inside and outside the scope of governmental services in the field of education.