112 THE DISCOVERY OF THE CHILD functional error. One mistake tries to remedy another mistake. And the mental is always more damaged by it, even in its moral expression. For acrobatism is a physical struggle. Games and similar activities dissipate the higher qualities of man. What does one do when a joint is dislocated and causes defor- mities and pain and ailments of so many kinds? One puts the bone back into its place to restore it to normal functioning. This being done, all the consequences which were the effects of a single cause disappear of themselves. The educational error then was to let thought and fancy wander about vaguely allowing the senses to remain unused and the muscles inert, whereas senses, nerve centres and muscles constitute one whole. The correction needed is to put into an active state the functioning of the organs connected with the mental life. Mental work ought to be accompanied by sensations of truth and beauty, which reanimate it, and by move- ments which bring ideas into play and leave their traces in the external world, where men ought to be giving each other mutual help. Muscular exercises ought always to be at the service of the mind, and should not abdicate in order to make themselves servants of the material part of the nutritive life in what is called the * physical life'. For example, work is a physical exercise which is at the service of the mind, and when man works, it helps indirectly to make the blood circulate and the lungs to breathe. The problem of health is also, therefore, a problem of work. To work in the open air, when conditions of nutrition are good, within the limits which the higher functions of the human mind permit, is to live normally and to attain perfect health. GYMNASTICS AND BEHAVIOUR In the ordinary schools it is usual to call by the name ** gym- nastics" a kind of collective muscular discipline the aim of which is to carry out movements under commands given to a whole class. This work in the gymnasium is often a first step towards acrobatics.