The improvements effected in cities through city planning commissions, both with regard to street location for the better routing of traffic, and the laying out of parks and the location of public buildings, have been so apparent, that the idea has been taken up by rural communities and a few states have passed legislation for the creation of special agencies for rural community planning. Thus Massachusetts has for several years had a Town Planning Commission and in 1919 Wisconsin passed an act[92] creating a division on rural planning of the State Department of Agriculture, and creating rural planning committees in each county. In 1920 thirty-six counties had organized such committees under this law and had already accomplished much under its authority.[93] Some of the more progressive land companies which are colonizing new lands in northern Wisconsin are making definite community plans to encourage settlement,[94] and in California the State Land Settlement Board has done much to encourage better rural planning by the demonstrations which it has made in its farm colonies at Durham and Delhi.[95] The Extension Services of several of the State agricultural colleges have experts on landscape art who give assistance in the improvement of public grounds and in community planning. A system of numbering farms has recently been invented which is based upon the relations of farms to their community centers and which therefore makes necessary the definite location of rural community areas and their boundaries. This is known as the "Clock System" rural index and is now in use in four counties in New York State. The county map published in the directory shows the different communities outlined by heavily shaded lines and the farm numbers radiate from the community centers. On the map each community is divided as a spider's web into a number of small spaces by twelve dotted lines that extend from each village on the same radii as the hour-marks on the dial of a clock, and by concentric circles which are a mile apart from each community center. Each set of lines and circles extends to the community boundary, and the farm is given a number which shows the sector in which it is located with reference to the distance from the community center. In front of a farm will be found a number, usually just below the mail box, such as Alton 3-2-K. This indicates that the farm is in the direction of the 3 o'clock mark on a clock, or east, of Alton; the second term, 2, shows that it is between two and three miles from Alton and the letter K enables one to locate the individual farm on the small area between the 3 o'clock and 4 o'clock radial lines and the two and three mile circles. In the directory accompanying the map the names of all householders are arranged alphabetically and also serially by their numbers, so that the name of the householder at a certain number of his location on the map may be readily ascertained. This system not only makes necessary a