A man who makes hammers may at one time have made his own files, had a shop for that. But, as trades became specialized, he found it better and cheaper to buy his files. Perhaps the supply is suddenly cut off. Now he could reassemble from the scrap-heap the file machinery and make files again, but it would be at the cost of putting so much time and energy into that branch as to paralyze the hammer factory. So, Nature found that men rarely lost their legs and that it was more economical to divert the organization and the energy that reproduced legs into the brain, which enables men to supply themselves and their fellows, when occasion arises, with artificial legs. Accordingly we have lost much of the power of automatic self-healing and have gained much power of deliberate self-healing. While distrusting crutches and drugs, therefore, because we see the immediate effect of them, but cannot know the remote effects of them, we cannot refuse a hot-water bottle or an anæsthetic when the pain, the symptom of the disorder, becomes dangerous in itself. The fever of typhoid represents a battle within which must be fought out to a conclusion—successful or not. But, when the patient is in danger of dying from the high temperature, it is no inconsistency for a mental or spiritual healer to cool the room or sponge the patient with alcohol. Before we resort to the dentist for the aching tooth, we may reduce the inflammation by abstaining from food and starving the blood corpuscles, which hasten to the diseased part, until, perhaps, they feed upon the weaker and obnoxious tissues. This abstinence will go far toward removing the restlessness that is so torturing an accompaniment of the pain. These are the physical remedies. The mental ones consist mainly in trying to isolate the aching member, to realize that it is the tooth, not you, that aches, and to watch it as if it were a separate person. A little boy was asked how he felt after a feast of green apples. “I have a pain in the middle of my stomach,” he said, “but the rest of me feels fine.” A further mental remedy is to send to that separated part, the nerve, the assurance that you have already its message, which is that there is inflammation in the tooth and that you will attend to it as speedily as possible. The nerve gets tired, as it were, of repeating a message that gets no attention just as it gets tired of reporting the ticking of a clock so that we become unconscious of it; although, if we suspected that it was the knocking of a burglar’s tool, we should be kept awake by it night after night.