During the morning and afternoon sessions the pupils should be given a recess for fifteen or twenty minutes, and when the weather will permit all the children should be required to go outdoors and engage in some form of play or exercise, properly supervised by a thoroughly competent individual. This will not only benefit the pupils physically, but will also make the mind more active and aid very materially in their mental development. In addition to this exercise, some time during the day the windows should be opened, except possibly in extremely cold weather, and the teacher and pupils should engage in some form of calisthenics. This will tend to keep the pupils in a fit physical condition and mentally alert for the balance of the day. The school grounds should be provided with modern equipment for the proper development of the children physically and should be supervised by kind and well trained attendants. Every school should have a well equipped and properly supervised gymnasium. School Dis-eases At one time the school was thought to be largely responsible for the spread of dis-eases among children, but this idea is changing in later years. In reality there are no specific school dis-eases. The dis-eases that have been so referred to are merely those abnormal conditions incident to childhood and youth. Rosenau gives a very interesting article on this subject. He says: “Parents naturally come to regard the school as a veritable pesthouse for the spread of communicable dis-eases of childhood—especially measles, whooping cough, mumps, diphtheria, scarlet fever, common colds, etc. Many of these dis-eases prevail in epidemic form during the summer time, when school is closed, and under other circumstances which show the epidemics may be independent of school attendance. It is difficult to determine just what part is played by the commingling of the pupils in school in the spread of such dis-eases and what part is due to other factors. Some dis-eases take a sudden jump in the autumn with the opening of school. Further, these dis-eases are not contracted by the school children alone, but are carried home to the other members of the household, and thereby create secondary foci. This problem of the communicable dis-eases and the school is far from solution; the spread of these dis-eases has not been conquered by medical inspection, and their relation to school attendance is one that needs careful observation and study.” Thus we see that the cause of school dis-eases has not been answered, and we find in this article that which strengthens the contention of Chiropractic—that the cause of the dis-ease is in the child and not something introduced from the outside.