In every community where the tuberculosis problem has been seriously taken in hand the importance of the presence of the infection in children had to be considered and this has been carefully studied by those who realize that tuberculosis, far from being a disease chiefly of adult life, is intimately associated with childhood. Therefore, is it not most important that all children, who have either been exposed to tuberculosis through the presence of an active case in their home, or show a family predisposition to the disease, should be given special consideration, and every opportunity furnished to make it possible for them to withstand the latent infection or to overcome the inherited lack of resistance? The best means of meeting this important problem, as far as school children are concerned, is through the medium of Open Air Schools, not only because of the benefit to the individual case, but also because of the very important educational influence on the community at large. The first Open Air School was opened in Charlottenburg, Germany, a suburb of Berlin, in the year 1904, a school of a new type, to which the Germans gave the name Open Air Recovery School. The object was to create a school where children could be taught and cured at the same time, and this same purpose has obtained in all other schools of similar type which have since been opened. This new educational venture was designed for backward and physically debilitated pupils who could not keep up with the work in the regular schools and who were not so mentally deficient that they were fit subjects for the classes of mentally subnormal children. It was felt that if these children were sent to sanatoria they would undoubtedly improve physically, but would fall back in the class work; while, on the other hand, if they remained in the regular school they would deteriorate physically. It was to meet these needs, then, that this new type of school was devised. As the name implies, the school was held almost entirely in the open air, the regime consisting of outdoor life, plenty of good food, strict hygiene, suitable clothing, and school work so modified as to suit the conditions of the children. During its first year the Charlottenburg School was open for only three months, but upon publication of the first report of the results accomplished it was decided to keep the school open a longer period. The desire to open other schools of similar type spread rapidly throughout Germany, as well as the rest of Europe and other parts of the world.