=Character of the Worthy Life.=--If, however, it is possible to add to the worth of the life of the child by controlling and modifying his natural reactions, the first problem confronting the scientific educator is to decide what constitutes a life of worth. This question belongs primarily to ethics, or the science of right living, to which the educator must turn for his solution. Here it will be learned that the higher life is one made up of moral relations. In other words, the perfect man is a social man and the perfect life is a life made up of social rights and duties, wherein one is able to realize his own good in conformity with the good of others, and seek his own happiness by including within it the happiness of others. But to live a life of social worth, man must gain such control over his lower physical wants and desires that he can conform them to the needs and rights of others. He must, in other words, in adapting himself to his social environment, develop a sense of duty toward his fellows which will cause him to act in co-operation with others. He must refuse, for instance, to satisfy his own want by causing want to others, or to promote his own desires by giving pain to others. Secondly, he must obtain such control over his physical surroundings, including his own body, that he is able to make these serve in promoting the common good. In the worthy life, therefore, man has so adjusted himself to his fellow men that he is able to co-operate with them, and has so adjusted himself to his physical surroundings that he is able to make this co-operation effective, and thus live a socially efficient life. FACTORS IN SOCIAL EFFICIENCY =A. Knowledge, a Factor in Social Efficiency.=--The following simple examples will more fully demonstrate the factors which enter into the socially efficient life. The young child, for instance, who lives on the shore of one of our great lakes, may learn through his knowledge of colour to distinguish between the water and the sky on the horizon line. This knowledge, he finds, however, does not enter in any degree into his social life within the home. When on the same basis, however, he learns to distinguish between the ripe and the unripe berries in the garden, he finds this knowledge of service in the community, or home, life, since it enables him to distinguish the fruit his mother may desire for use in the home. One mark of social efficiency, therefore, is to possess knowledge that will enable us to serve effectively in society.