Having considered the dangers to society through criminal hypnotic
  suggestion, let us now consider what dangers there may be to the
  individual who is hypnotized.
Before citing evidence, let us consider the subject from a rational
  point of view. Several things have already been established. We know
  that hypnotism is akin to hysteria and other forms of insanity--it is, in
  short, a kind of experimental insanity. Really good hypnotic subjects
  have not a perfect mental balance. We have also seen that repetition of
  the process increases the susceptibility, and in some cases persons
  frequently hypnotized are thrown into the hypnotic state by very slight
  physical agencies, such as looking at a bright doorknob. Furthermore, we
  know that the hypnotic patient is in a very sensitive condition, easily
  impressed. Moreover, it is well known that exertions required of
  hypnotic subjects are nervously very exhausting, so much so that
  headache frequently follows.
From these facts any reasonable person may make a few clear 
  deductions.
  First, repeated strain of excitement in hypnotic seances will wear out
  the constitution just as certainly as repeated strain of excitement in
  social life, or the like, which, as we know, frequently produces nervous
  exhaustion. Second, it is always dangerous to submit oneself to the
  influence of an inferior or untrustworthy person. This is just as true
  in hypnotism as it is in the moral realm. Bad companions corrupt. And
  since the hypnotic subject is in a condition especially susceptible, a
  little association of this kind, a little submission to the inferior or
  immoral, will produce correspondingly more detrimental consequences.
  Third, since hypnotism is an abnormal condition, just as drunkenness is,
  one should not allow a public hypnotizer to experiment upon one and make
  one do ridiculous things merely for amusement, any more than one would
  allow a really insane person to be exhibited for money; or than one
  would allow himself to be made drunk, merely that by his absurd antics
  he might amuse somebody. It takes little reflection to convince any one
  that hypnotism for amusement, either on the public stage or in the home,
  is highly obnoxious, even if it is not highly dangerous. If the
  hypnotizer is an honest man, and a man of character, little injury may
  follow. But we can never know that, and the risk of getting into bad
  hands should prevent every one from submitting to influence at all. The
  fact is, however, that we should strongly doubt the good character of
  any one who hypnotizes for amusement, regarding him in the same light as
  we would one who intoxicated people on the stage for amusement, or gave
  them chloroform, or went about with a troup of insane people that he
  might exhibit their idiosyncrasies. Honest, right-minded people do not
  do those things.
At the same time, there is nothing wiser that a man can do than 
  to
  submit himself fully to a stronger and wiser nature than his own. A
  physician in whom you have confidence may do a thousand times more for
  you by hypnotism than by the use of drugs. It is a safe rule to place
  hypnotism in exactly the same category as drugs. Rightly used, drugs are
  invaluable; wrongly used, they become the instruments of the murderer.
  At all times should they be used with great caution. The same is true of
  hypnotism.
Now let us cite some evidence. Lafontaine, a professional hypnotist,
  gives some interesting facts. He says that public hypnotic
  entertainments usually induce a great many of the audience to become
  amateur hypnotists, and these experiments may cause suffocation. Fear
  often results in congestion, or a rush of blood to the brain. "If the
  digestion is not completed, more especially if the repast has been more
  abundant than usual, congestion may be produced and death be
  instantaneous. The most violent convulsions may result from too complete
  magnetization of the brain. A convulsive movement may be so powerful
  that the body will suddenly describe a circle, the head touching the
  heels and seem to adhere to them. In this latter case there is torpor
  without sleep. Sometimes it has been impossible to awake the subject."
A waiter at Nantes, who was magnetized by a commercial traveler,
  remained for two days in a state of lethargy, and for three hours Dr.
  Foure and numerous spectators were able to verify that "the extremities
  were icy cold, the pulse no longer throbbed, the heart had no
  pulsations, respiration had ceased, and there was not sufficient breath
  to dim a glass held before the mouth. Moreover, the patient was stiff,
  his eyes were dull and glassy." Nevertheless, Lafontaine was able to
  recall this man to life.
Dr. Courmelles says: "Paralysis of one or more members, 
  or of the
  tongue, may follow the awakening. These are the effects of the
  contractions of the internal muscles, due often to almost imperceptible
  touches. The diaphragm--and therefore the respiration--may be stopped in
  the same manner. Catalepsy and more especially lethargy, produce these
  phenomena."
There are on record a number of cases of idiocy, madness, and 
  epilepsy
  caused by the unskillful provoking of hypnotic sleep. One case is
  sufficiently interesting, for it is almost exactly similar to a case
  that occurred at one of the American colleges. The subject was a young
  professor at a boys' school. "One evening he was present at some public
  experiments that were being performed in a tavern; he was in no way
  upset at the sight, but the next day one of his pupils, looking at him
  fixedly, sent him to sleep. The boys soon got into the habit of amusing
  themselves by sending him to sleep, and the unhappy professor had to
  leave the school, and place himself under the care of a doctor."
Dr. Ernest Hart gives an experience of his own which carries 
  with it its
  own warning. Says he:
"Staying at the well known country house in Kent of a distinguished
  London banker, formerly member of Parliament for Greenwich, I had been
  called upon to set to sleep, and to arrest a continuous barking cough
  from which a young lady who was staying in the house was suffering, and
  who, consequently, was a torment to herself and her friends. I thought
  this a good opportunity for a control experiment, and I sat her down in
  front of a lighted candle which I assured her that I had previously
  mesmerized. Presently her cough ceased and she fell into a profound
  sleep, which lasted until twelve o'clock the next day. When I returned
  from shooting, I was informed that she was still asleep and could not be
  awoke, and I had great difficulty in awaking her. That night there was a
  large dinner party, and, unluckily, I sat opposite to her. Presently she
  again became drowsy, and had to be led from the table, alleging, to my
  confusion, that I was again mesmerizing her. So susceptible did she
  become to my supposed mesmeric influence, which I vainly assured her, as
  was the case, that I was very far from exercising or attempting to
  exercise, that it was found expedient to take her up to London. I was
  out riding in the afternoon that she left, and as we passed the railway
  station, my host, who was riding with me, suggested that, as his friends
  were just leaving by that train, he would like to alight and take leave
  of them. I dismounted with him and went on to the platform, and avoided
  any leave-taking; but unfortunately in walking up and down it seems that
  I twice passed the window of the young lady's carriage. She was again
  self-mesmerized, and fell into a sleep which lasted throughout the
  journey, and recurred at intervals for some days afterward."
In commenting on this, Dr. Hart notes that in reality mesmerism 
  is
  self-produced, and the will of the operator, even when exercised directly
  against it, has no effect if the subject believes that the will is being
  operated in favor of it. Says he: "So long as the person operated on
  believed that my will was that she should sleep, sleep followed. The
  most energetic willing in my internal consciousness that there should be
  no sleep, failed to prevent it, where the usual physical methods of
  hypnotization, stillness, repose, a fixed gaze, or the verbal expression
  of an order to sleep, were employed."
The dangers of hypnotism have been recognized by the law of 
  every
  civilized country except the United States, where alone public
  performances are permitted.
Dr. Cocke says: "I have occasionally seen subjects who 
  complained of
  headache, vertigo, nausea, and other similar symptoms after having been
  hypnotized, but these conditions were at a future hypnotic sitting
  easily remedied by suggestion." Speaking of the use of hypnotism by
  doctors under conditions of reasonable care, Dr. Cocke says further:
  "There is one contraindication greater than all the rest. It applies
  more to the physician than to the patient, more to the masses than to
  any single individual. It is not confined to hypnotism alone; it has
  blocked the wheels of human progress through the ages which have gone.
  It is undue enthusiasm. It is the danger that certain individuals will
  become so enamored with its charms that other equally valuable means of
  cure will be ignored. Mental therapeutics has come to stay. It is yet in
  its infancy and will grow, but, if it were possible to kill it, it would
  be strangled by the fanaticism and prejudice of its devotees. The whole
  field is fascinating and alluring. It promises so much that it is in
  danger of being missed by the ignorant to such an extent that great harm
  may result. This is true, not only of mental therapeutics and hypnotism,
  but of every other blessing we possess. Hypnotism has nothing to fear
  from the senseless skepticism and contempt of those who have no
  knowledge of the subject." He adds pertinently enough: "While hypnotism
  can be used in a greater or less degree by every one, it can only be
  used intelligently by those who understand, not only hypnotism itself,
  but disease as well."
Dr. Cocke is a firm believer that the right use of hypnotism 
  by
  intelligent persons does not weaken the will. Says he: "I do not believe
  there is any danger whatever in this. I have no evidence (and I have
  studied a large number of hypnotized subjects) that hypnotism will
  render a subject less capable of exercising his will when he is relieved
  from the hypnotic trance. I do not believe that it increases in any way
  his susceptibility to ordinary suggestion."
However, in regard to the dangers of public performances by 
  professional
  hypnotizers, Dr. Cocke is equally positive. Says he:
"The dangers of public exhibitions, made ludicrous as they 
  are by the
  operators, should be condemned by all intelligent men and women, not
  from the danger of hypnotism itself so much as from the liability of the
  performers to disturb the mental poise of that large mass of ill-balanced
  individuals which makes up no inconsiderable part of society." In
  conclusion he says: "Patients have been injured by the misuse of
  hypnotism. * * * This is true of every remedial agent ever employed for
  the relief of man. Every article we eat, if wrongly prepared, if stale,
  or if too much is taken, will be harmful. Every act, every duty of our
  lives, may, if overdone, become an injury.
"Then, for the sake of clearness, let me state in closing 
  that hypnotism
  is dangerous only when it is misused, or when it is applied to that
  large class of persons who are inherently unsound; especially if that
  mysterious thing we call credulity predominates to a very great extent
  over the reason and over other faculties of the mind."
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