Greatness always has its penalties. Other ills besides death love a shining mark. Pain is one of them, and headache its best exemplar. If there be one thing about our bodies of which we are peculiarly and inordinately proud it is that expanded brain-bulb which we call the head. Yet it aches oftener than all the rest of us put together. Headache is the commonest of all pains, which fact gives the slight consolation that everybody can sympathize with you when you have it. One touch of headache makes the whole world kin, and the man or woman who has never had it would be looked upon as a creature abnormal and "a thing apart." It has even become incorporated into our social fabric as one of the sacred institutions of the game of polite society. How could we possibly protect ourselves against our instructors in youth and our would-be friends in later life if there were no such words as "a severe headache"? What is a headache, and why does it ache the head? This is a wide and hotly disputed problem. But one fact, which is obvious at the first intelligent glance, becomes clearer and more important with deeper study, and that is that it _is not the fault of the head_. When the head aches, it is, nine times out of ten, simply doing a combination of scapegoat and fire-alarm duty for the rest of the body. Just as the brain is the servant of the body, rather than its master, so the devoted head meekly offers itself as a sort of vicarious atonement for the sins of the entire body. It is the eloquent spokesman of such "mute, inglorious Miltons" as the stomach, the liver, the muscles, and the heart. The humblest and least distinguished of all the organs of the body can order the lordly head to ache for it, and the head has no alternative but to obey. To discuss the cause of headaches is like discussing the cause of the human species. It is one of the commonest facts of every-day observation, and can be demonstrated almost at will, that any one of a hundred different causes,--a stuffy room, a broken night's sleep, a troublesome letter, a few extra hours of work, eating something that disagrees, a cold, a glare of light in the eyes,--any and all of these may bring on a headache. The problem of avoiding headaches is the problem of the whole conduct of life.