This germ is one which is always to be found in the glands of any person’s scalp or hairy portions of the body. These glands are known as the sebaceous glands. They are the ones which secrete the oily substance that is necessary for the health of the skin and hair. You have enough of the oily substances in your own hair and skin, and it is usually free from germs at this time if you have used only YOUR OWN BRUSH. But the moment you use a brush belonging to some older and full-grown woman you carry to your own scalp these germs. If some of the other germs which are sometimes found upon common brushes get onto your scalp, there is another trouble for you to combat――dandruff. In the first case you simply add oily stuff to your own supply, get over-much of the oil; in the other case, dandruff is piled thick with the fatty material and then comes scalp disease. This may go on for some time and not noticeably affect you, but it may cause in a few weeks a certain form of eczema about the forehead and even the face. This is a very important matter for all girls and young women to remember. I have shown you that on the approach and for some time after puberty, all the tiny glands of the skin are enlarged and very active, so you can now see that there are hundreds of thousands of little holes for the germs to get into, and they do so from the brushes you are in the habit of using――that is, most of you. When these germs have located themselves upon the scalp, they soon commence to show the fact by giving you a muddy complexion. Sometimes you will be accused of not thoroughly washing your face, so marked is the line around your forehead and neck made by the attack of these germs. When the openings of the glands begin to gape, the effect is not agreeable to you nor to your friends.