[Footnote 11: Small, Maynard & Co.. Boston, 1909.]
Imaginary Drug Effects.—Drug effects may be produced through the imagination. Physicians know that when patients are persuaded that certain effects are to be expected from a particular medicine, the effects may follow all the same in sensitive, imaginative people, if that medicine is replaced by some inert compound. Many a physician who has used bread pills or other placebos to replace a drug that he did not want the patient to acquire a habit for, has thus been able to allow good effects to go on without interruption, where the stoppage of medicine had previously interfered with the continuance of the good habit that had been formed. Very few physicians have not seen the effect of a hypodermic of pure water when a hypodermic of morphine is demanded, and when the patient would not sleep without having the hypodermic injection. Sleeping powders of various kinds can sometimes with distinct advantage be replaced by inert materials, because the patient's mind is fixed upon the idea of sleep coming after a certain time and they, in consequence, compose themselves to rest.
The Nerves and Tissues.—Cases occur where disturbances of vitality are noted as a consequence of nervous affections, though no gross lesion of the nervous system is demonstrated. Certain nervous people suffer from ulcerative conditions of their hands, and it is evident that in some the nervous impulses [{89}] that would ordinarily keep the skin surface in good, healthy condition are insufficient. Some people who use a typewriter have no difficulty at all with the ends of their fingers, while others are subject even to loss of skin or ulcerative conditions that make it almost impossible for them to go on with their work. In some this is true in the winter, in others in the summer. There are a number of skin conditions which are due to nervous factors and these evidently point to the influence of the central nervous system in keeping the forces of our body in such health, and resistive vitality, as will enable us to carry on whatever work we may wish to. This is, of course, a very individual matter. Some people chap very easily, some suffer from chilblains, or are frost-bitten even on slight exposure, and these peculiarities are evidently dependent on the intensity of the nervous impulses as well as the tone of the circulation, which itself depends on the nerves to a great extent.
It is evident that some of these disturbances are not enduring, but are only temporary and therefore are due to functional disturbances of the nervous system. Physicians often see hysterical patients suffering from intense pain that requires an injection of morphine, yet after a series of such incidents, the physician is able to give an injection of plain water and produce just as good an anodyne effect. In these cases some influence of the will is enough to correct the painful disturbances. Occasionally a single member loses sensation, or motion, or both, yet the fact that its nutrition does not suffer shows that there is only disturbance in the motor connections between it and the central nervous system and not in the sensory nor trophic tracts, and that this functional defect may be restored by some favorable influence.
Nerve Supply and Health.—We know now that when a part of the body is cut off from its connections with the central nervous system, it begins at once to be lowered in vitality and gradually tends to dissolution. This will be true in spite of the fact that the circulation continues as actively as before. It is not necessary, indeed, that the nerve trunk to a part should be cut, if it is sufficiently compressed its function is stopped and various disturbances begin to appear in the vitality of the part which it supplies. A typical example is to be seen in certain fractures of the clavicle, where a fragment presses on one of the nerves leading to the arm. After a time pains develop in the arm, a burning feeling is noticed in the skin, which becomes shiny and cold and of distinctly lowered vitality. Even a slight injury to the arm will now produce a serious ulcerative condition. There are evidently important influences for life that flow down through the nerves from the central nervous system, quite as important in their way as the nutritional elements which flow through the blood.
How these influences of the mind on the body are accomplished is a portion of that larger mystery of the influence of mind, or soul, or principle of life, on the material elements of which our body is composed. Why a man receives a shock of lightning or a charge of electricity at high voltage, and without a mark on his body or a change in any cell that we can make out, be dead, though he was living an instant before, is another of these mysteries too familiar for discussion. There is no change in the weight of the body, nothing physical has happened, but what was living matter with the power to accomplish the functions of living things is now simply dead material, unable to resist the invasion of saprophytic micro-organisms which will at once, [{90}] unhampered, proceed to tear it down, though the preceding moment resistive vitality was completely victorious. The mystery remains, but the mechanism of the influence can now at least be studied with much more satisfaction than was the case a few years ago.
Death and the Mind.—The extent to which the mind can be made to influence the body is apparently without limit. While the doctor is frequently disturbed by the fact that death occurs when there is no adequate physical reason for it, just because the patient has looked forward to it with complete preoccupation of mind, there is no doubt that occasionally death may be put off in the same way. We talk about people living on their wills. This is a literal expression of what actually occurs in certain cases. On the other hand, without the will to live, it is sometimes extremely difficult to keep alive patients who are in a run down condition. If one of an old married couple dies when the other is ill, we conceal the sad news very carefully from the survivor. This is done not alone to put off the shock and sorrow for a time, but because often, under such circumstances, there will be no will to live.
When the vital forces have run down to such a degree that it seems impossible, so far as ordinary medical reason goes, to look for anything but dissolution, patients still cling to life if there is some reason why they want to live until a definite time. It does not happen so much with the acute diseases but is quite common in chronic cases. Patients will live on expectant of seeing a friend who is known to be hurrying to them, or for some other purpose on which they very strongly set their minds. In the life of Professor William Stokes, the Irish physician, to whom we owe the introduction of the stethoscope to the English medical world, and many other important contributions to medicine, there is a striking story that illustrates this power of the will to maintain life until a definite moment.
An old pensioner, a patient of Stokes' in the Meath Hospital whose life was despaired of, and whose death was hourly expected, was one morning distressed and disappointed at observing that Stokes, who believing that the man was unconscious at the time, and that it was useless to attempt anything further as his condition was hopeless, was passing by his bed. The patient cried out: "Don't pass me by, your honor, you must keep me alive for four days." "We will keep you as long as we can, my poor fellow," answered Stokes; "but why for four days particularly?" "Because," said the other, "my pension will be due then, and I want the money for my wife and children; don't give me anything to sleep for if I sleep I'll die." On the third day after this, to the amazement of Stokes and all the class, the patient was still breathing. On the morning of the fourth day he was found still breathing and quite conscious, and on Stokes' coming into the ward, he saw the patient holding the certificate which required the physician's signature in his hand. On Stokes approaching him, the dying man gasped out. "Sign, sign!" This was done, the man sank back exhausted, and in a few minutes after crossed both hands over his breast and said, "The Lord have mercy on my soul," and then passed quietly away.
Dread and Death.—Dr. Laurent in his little book, "La Médecine des Âmes," [Footnote 12] has a story of similar kind but from a very different motive: