Any severe pain or profuse flow during the period or a discharge between periods indicates a weakened or diseased condition and should not be neglected, for it sooner or later will affect the whole system. A woman suffering from female diseases not only is unable to perform her work in a normal manner but the pale skin, dark circles under the eyes and drawn haggard look which accompany these conditions rob her of her charm of physical excellence. The menstrual flow appears, as a rule, every twenty-eight days, although the length of time varies with the individual. The average duration is five days, but varies from three to seven. The flow consists of blood from the uterine mucosa (lining of the womb) together with small quantities of mucus. The color generally is dark at first while later it becomes more pale. Women in poor health often have a pale discharge. There always is a faint odor to the menstrual flow, which has been likened to the odor of marigolds. The quantity varies with the individual. Usually fleshy girls flow more than thin ones and dark complexioned ones than light ones. The average quantity is four to six fluid ounces. The time between the periods is required by the uterus or womb to first restore the lining and then prepare it for the reception of the ovum. Every month one or more ova (eggs) leave the ovary, pass to the uterus and, if not impregnated, pass off with the menstrual flow. The material prepared for the reception of the ovum is used to nourish the new life if pregnancy occurs, but when it does not, this surplus passes off in the form of the menstrual flow.