The first proposition that we have to face is that like produces like. There are modes of education, of conduct in life, and of occupation that should be avoided where a boy or girl is handicapped by a bad heredity. There are special precautions and attention to physiologic laws which would save the minds of many young men and women with a bad heredity from passing into a state of inefficiency and actual disease. Heredity implies only potentiality toward good or evil, and the latter may be averted by knowledge and the proper practice. _Temperament._—This comprises the general make up of the individual, the shape of the head, the appearance of the eyes, the mobility of the features, the texture of the hair and skin, and the kind of movement. The recognition of the kind of temperament, and a suitable training for its best development, is of the greatest importance in attaining good health and success in life. There are four general types of temperaments—the nervous, the phlegmatic, the arthritic, and the scrofulous or lymphatic. The nervous temperament has certain marked characteristics, as the small, wiry figure, the well-shaped head, the bright, restless eye, nervous bearing, highly strung and sensitive nerves, feeling pain keenly and bearing it badly. This woman is imaginative, sensitive, fond of intellectual work, often artistic and ambitious. In her the brain and mind are dominant above all else. When run down, this woman will be difficult to bring up again to the normal level. She will grow thin, dyspeptic, irritable, and often neuralgic. She will be peculiarly liable to nervous disorders. This temperament has its special temptations—alcohol and sedative drugs are two of them. Alcohol is not taken steadily or for social reasons, but for the effect of alcohol on the brain, and there is the greatest danger of becoming addicted to alcoholic habits, and finally of becoming an uncontrollable dipsomaniac. The phlegmatic or bilious temperament relates more to the training of the body, since in this class of cases the mind is not exposed to the same dangers, but the oversanguine temperament has its own dangers, which may lead to lack of effort, speculation, and financial ruin. The arthritic have a predisposition to both rheumatism and gouty disorders, to which they are distinctly more liable than others, and the fact that there is this latent tendency should be taken into consideration during childhood and youth. _Social Instincts._—Social instincts lie at the foundation on which the family and community is based. It may be said that any individual who is destitute of them is in an abnormal condition, hence a right training of the social instincts is, beyond doubt, one of the most important means of securing happiness to the individual and order to society. The child’s or youth’s relation to others, her affection for others, and her altruistic practices, all go for the making of society, good citizenship, and patriotism in the race.