School programmes, after they have been based upon the laws of a child's development, should provide for frequent change of subject, alternating studies requiring mental concentration with studies permitting motor activity, and arranging for very short periods of the former. Anaemic children should be relieved of all anxiety as to the results of their efforts, and only short hours of daylight work required of them. The disastrous consequences of eye strain should be understood by all in charge of children who are naturally hypermetropic. The ventilation of a class room is far more important than its decoration or even than a high average percentage in mathematics, and the lack of pure air is one of the auxiliary causes of nervous exhaustion in both pupils and teachers. Deficient motor control is a most trustworthy indication of fatigue in children, and teachers may safely use it as a rough index of the amount of effort to be reasonably expected of their pupils. Facial pallor or feverish flushes are both evidences of overtasking, and either hints that fatigue has already begun. As to unfavorable atmospheric conditions, the teacher herself will undoubtedly realize them as soon as the children, but she should remember that effort carried to the point of exhaustion, injurious as it is in an adult, is yet less harmful than it is to the developing nerve centers of the child. Because adults at work and at play reluctantly submit themselves to vitality tests, because few scientists are beseeching individuals to be tested, because almost no one yearns to be tested, the promotion of adult vitality and of community vitality can best be hastened by demanding complete vital statistics. Industrial insurance companies and mutual benefit societies are doing much to educate laborers regarding the effect upon vitality of certain dangerous and unsanitary trades, and of certain unhygienic habits, such as alcoholism and nicotinism. Progress is slower than it need be because state boards of health are not gathering sufficiently complete information about causes of sickness and death. American health and factory inspection is not even profiting, as it should, from British, German, and French statistics. Statistics are in ill repute because the truth is not generally known that our boasted sanitary improvements are due chiefly to the efficient use of vital statistics by statesmen sanitarians.[7]