Four more Open Air Schools have since been established, three on ferryboats and one on the roof of the Vanderbilt Clinic at West Sixtieth street. Officially, all these schools are considered to be annexes of the regular public schools. In October, 1909, $6,500 was granted to the Board of Education by the Board of Estimate and Apportionment for the purpose of remodeling rooms in some of the public schools for use as Open Air Rooms. A special conference was held in December of that year by medical and school authorities to decide how best to remodel, furnish and equip these new rooms for this purpose; also how the children should be chosen for these classes. It was decided that the maximum number of children admitted to any one open air classroom should not exceed twenty-five, the children to be chosen by the director of the tuberculosis clinic nearest the school and the school principal. No child was to be assigned to the room until the parents' permission had been secured in writing. Children moving from one district to another were to be followed up and cared for in the new district. No special rule was adopted defining the physical condition entitling the child to admission. Each case was to be considered individually, and the only definite rule was that no open case of tuberculosis should be admitted. The minimum temperature of the room was 50 degrees F. The rooms, wherever possible, were to be located on the third floor. The first of these open air classes was established in April, 1910. Such popular interest was awakened by the inauguration of these classes that, as a direct result, a special privilege was granted by the Commissioners of Central Park permitting children of the kindergarten classes of the public schools to pursue their studies in the open air in Central Park. At present New York has thirty-three Open Air Schools and Open Window Rooms, with a total enrollment of at least 1,000. * * * * * Chicago's first Outdoor School for Tuberculous Children was inaugurated as a result of the joint co-operation of the Chicago Tuberculosis Institute and the Board of Education. This school was opened during the first week of August, 1909, on the grounds of the Harvard School at Seventy-fifth street and Vincennes Road. The Board of Education assigned a teacher to the school and furnished the equipment, while the Tuberculosis Institute supplied the medical and nursing service, selected the children and provided the food. Except during inclement weather, the children occupied a large shelter tent in which thirty reclining chairs were placed. Meals were served in the basement of the school building, where a gas range, cooking utensils and tables were installed for this special purpose.