"No, but there is a sign that this change has taken place. The uterus is lined with a membrane in which are many blood vessels, and when the girl has reached this stage of development and becomes a woman, the vessels become very full of blood, so full that it oozes out through the walls of the blood vessels into the cavity of the uterus, and when it passes out of the vagina the girl becomes aware of it and knows that she has become a woman. "This process takes place once a month and is called menstruation, from the Latin _mensum_, a month." "Isn't it painful, mother?" "It ought not to be and is not, if the girl is perfectly well. But sometimes girls have dressed improperly and have displaced their internal organs, or they have exhausted themselves with pleasure-seeking, or in some other way have injured themselves, in which case they may suffer much pain. When girls get about this age mothers are very anxious about them, very desirous that they shall naturally and easily step over into the land of womanhood." "I should think that girls ought to be taught about themselves, so that they would not do the things which injure them." "I think they should, and that is why I am telling you all this to-day so that when the change comes to you, you will not be frightened and maybe do something from which you will suffer all your life long, as many girls have done. "The question of tight clothing becomes now much more important than ever before. You can see at once that the restriction of the clothing comes just over the part of the body where there is the least resistance." "Oh, yes, I remember about the seven upper ribs, that are fastened to both spine and breast-bone; and the five lower ribs, that are fastened directly only to the spine and are attached in front to the breast-bone by cartilage; and the two floating ribs, lowest of all, and fastened only to the spine. I have often wondered why the important organs of the abdominal cavity should not have been better protected." "It was needful to leave the front of the body covered only with muscular structure, or it could not be bent and twisted about as we can now bend it, and that would have hindered our activity. Just imagine yourself going about encased in bone from your shoulders to your hips." Helen laughed merrily. "I shouldn't like it," she said, "but that is just what is done by the corset, and folks get used to that." "Yes, they become accustomed to the pressure because the nerves lose their sensitiveness and no longer report their discomfort to the brain; but the injury continues, nevertheless." "Mother, I wish you'd tell me just how tight clothing is injurious. So many of the girls laugh at me because I don't wear a corset, and they declare it does not hurt them. They all say they wear their clothes perfectly loose and they think they prove it by showing me how they can run their fists up under their dress waists."