It is not alone the slighter, more or less negligible aches or pains, nor the vague discomforts that thus disappear when our attention is occupied, but even quite severe and otherwise unbearable pain may be modified to a great extent. A toothache that is bearable, though it nags at us constantly and never lets us forget its presence while we are occupied with many other things during the evening, may become a positive torture when we get to bed. This is not only because of physical conditions modifying the pain, for there seems no doubt that the warmth induced by the preliminaries for sleep and the bed-covering have a tendency to increase congestion, but it is mainly because as we doze off we are able, less and less, to inhibit our attention, or divert it from the pain that is present, and so this is emphasized until we have to do something for it or lose hours of sleep. This lack of inhibition, which characterizes the dozing hours, represents the state of mind in which people are who have no interest in their occupations, and who have ceased to find recreation in the ordinary pleasures of life, when pain of any kind comes to them. Cabanis, at the beginning of the nineteenth century, under the title of {85} "The Influence of the Moral on the Physical," discusses what we would now call mental influence on the body. He says: The great influence of what one may call the moral or mental on what may be called the physical is an incontestible fact. Examples without end confirm it every day. Every man capable of making observations finds proofs of it thousands of times in himself. Many physiologists and psychologists as well as moralists, have collected the evidence that brings out clearly this power of the intellectual operations and emotions on the different organs and the diverse functions of the living body. All of us could add new illustrations to these collections. Men who are rude and credulous talk of the effect of the imagination, and if they are not themselves its playthings and its victims, at least they know how to observe its effects In others. As a matter of fact, the action of our organs can be in turn excited, suspended, or totally inhibited, according to the state of mind, the change of ideas, the affections and the emotions.