Puberty is the period of maturing of the sexual organs. It occurs about the age of twelve, although there may be considerable variation as to this. It extends over a period of several years. As a rule, girls mature earlier in warm climates than in cold and in cities than in country districts. The signs of the approach of this period are the growth of hair on the pubes and other parts of the body, the enlargement of the breasts, a general rounding and increased grace of the body, the development of the pelvis so that the hips become more prominent, and a change in the mental qualities of the child, the girl naturally becoming more retiring. The menstrual function usually is not established at once, there being premonitory symptoms of a vague nature. There may be, at first, only a slight discharge of mucus tinged with blood, later the normal menstrual flow will be established. During this period of puberty there are great changes taking place in the girl's internal organs. This change and development requires considerable of the girl's strength and naturally influences her nervous system. It is for this reason that a girl at this period of her life should not be subjected to any great exertion, either physical or mental. She should have plenty of light, healthful exercise in the open air, but should not indulge in any very violent exercise. A little care at this time often will save her years of suffering. As the nervous system is greatly affected at this period there should be no great mental strain. In fact, if the girl shows many nervous symptoms, it may be wise to take her out of school for a year so that her strength may be used as Nature requires it. As a rule, too much work is required in school at this age. The school duties should be lessened and the girl allowed to rest a day or two during her menstrual period. The girl at this age should not attempt to accomplish as much work or study as the boy does. Her time at this period might better be occupied in learning the rudiments of housekeeping and home-making. Then, when her body has become developed, her strength can be spared and can be well used in the development of her mind. If the nervous strain too common at this age could be relieved we would have fewer nervous women and a healthier and happier posterity.