More conclusive still is the fact that animals can be hypnotized. Albert Moll, who is one of the ablest, and certainly one of the most unprejudiced, of modern scientific writers on the subject of hypnotism, writing from the standpoint of the Nancy school, makes the following observations on the subject of hypnotizing animals:—
"States resembling, or perhaps identical with, hypnosis, are also found in animals, and can easily be experimentally induced. The first experiments of this kind are referred to by the Jesuit Kircher,—the so-called experimentum mirabile Kircheri. Kircher described these experiments in 1646; but according to Preyer, the experiment had been made by Schwenter several years earlier. The most striking of these experiments, which are being continued in the present day, is as follows: A hen is held down on the ground; the head in particular is pressed down. A chalk line is then drawn on the ground, starting from the bird's beak. The hen will remain motionless. Kircher ascribes this to the animal's imagination; he said that it imagined that it was fastened, and consequently did not try to move. Czermak repeated the experiment on different animals, and announced in 1872 that a hypnotic state could be induced in other animals besides the hen. Preyer shortly after began to interest himself in the question, and made a series of experiments like Czermak's. Preyer, however, distinguishes two states in animals,—catalepsy, which is the effect of fear; and the hypnotic state. Heubel, Richet, Danilewsky, and Rieger, besides the authors mentioned above, have occupied themselves with the question.
"Most of the experiments have been made with frogs, crayfish, guinea-pigs, and birds. I have made many with frogs. This much is certain: many animals will remain motionless in any position in which they have been held by force for a time. There are various opinions as to the meaning of this. Preyer thinks many of these states are paralyses from fright, or catalepsy, produced by a sudden peripheral stimulus. In any case they vividly recall the catalepsy of the Salpêtrière, also caused by a strong external stimulus."[18]
The experiments of Kircher, above mentioned, were undertaken with a view of demonstrating his theory that animals possessed great powers of imagination. The chalk mark, he held, represented to the imagination of the hen a string with which she supposed herself to be bound. In his day, of course, nothing was known of hypnotism. It has since been demonstrated that the chalk mark has nothing to do with the production of the phenomenon. The same result follows when the chalk mark is omitted. The writer has hypnotized a pet rooster by Braid's method without using any violence whatever, or even touching the fowl. He was exceedingly tame, and it was only necessary to hold a small object directly before his eyes; when his attention was attracted, he would gaze steadily upon it, and in a very few minutes would go fast asleep. This could not have been a catalepsy caused by fright, nor could it have been the result of a belief in his inability to move, nor a peripheral stimulus caused by friction against the skin, nor could it have been suggestion. In fact, there is no legitimate conclusion apparent except that it was a true hypnosis, identical with that produced on human beings by Braid's methods.
This branch of the subject has been dwelt upon somewhat at length, not merely for the purpose of showing that the adherents of the Nancy school carry the doctrine of suggestion too far, but because it is an important point in the study of the subject, and throws a flood of light upon many important and perplexing problems, as will be seen hereafter. The principle to be borne in mind is this: hypnosis can be produced by Braid's method either with or without the aid of suggestion.
This does not militate in the slightest degree against the doctrine of suggestion when its powers and limitations are properly understood. It still remains true that all hypnotic phenomena subsequent to the induction of the condition are the result of suggestion in some form. This is the grand discovery of the Nancy school; and when it is once appreciated and understood, it will be found to constitute the master-key which will unlock the secrets of every psychological mystery. That it is unqualifiedly true no longer admits of serious doubt; it is acknowledged by nearly every scientist in the civilized world who has given the subject intelligent attention. It is true that the great name of Charcot has commanded a following; but however valuable may have been his observations in the infancy of the science, it has become obvious to most of his former followers that his fundamental hypothesis is defective, and that his conclusions are therefore necessarily unreliable.
The discussion of the merits of the Paris school will be brief, and will be chiefly confined to a statement of the reasons for considering its experiments and conclusions unreliable, and to pointing out a few of the more obvious sources of its errors.
The first source of error lies in the fact that the experiments of this school are made almost exclusively upon hysterical women. The assumption is that hypnotism is a nervous disease, and that the disease is found in its most pronounced form in hysterical subjects. That this proposition is unqualifiedly wrong is positively known to every student of hypnotism outside the Paris school, and needs no further refutation than the bare statement that the experience of all other schools goes to demonstrate the fact that the best hypnotic subjects are perfectly healthy persons.
Another source of error lies in the fact that they ignore suggestion as a necessary factor in the production of hypnotic phenomena. Of course they are aware of the potency of suggestion when purposely and intelligently employed; but they hold that very many of the most important of the phenomena can be produced without its aid. These, however, are principally physical effects, such as causing any muscle of the body to contract by pressing upon the corresponding nerve, and then releasing the tension by exciting the antagonistic muscle. The condition necessary for the production of this phenomenon is called by Charcot, "neuro-muscular hyperexcitability." In the able and interesting work by Binet and Féré, pupils of Charcot, a chapter is devoted to this branch of the subject. They record, with a scientific exactitude that is very edifying, many curious results in the way of causing contracture of various muscles by kneading, pressure, percussion, etc., releasing the tension by exciting the opposing muscles, and transferring the contractures from one muscle to another by the magnet. Then, with an ingenuousness that is truly charming, they add, as a "singular fact," that "contractures can be easily produced in many hysterical patients in their waking state, either by kneading the muscles, by pressure on the nerves, or by striking the tendons. These contractures in the waking state are, indeed, of the same nature as those which occur during lethargy, since they yield to the excitement of the antagonistic muscles, and may be transferred by the magnet."
After this admission it seems superfluous to remark that this class of experiments prove nothing more than that the state of neuro-muscular hyperexcitability is a pathological symptom common to hysterical patients, whether in the waking state or in hypnotic lethargy. They certainly prove nothing which can be construed as characteristic of hypnotism; and the Nancy school wastes its time in demonstrating that the symptoms cannot be reproduced in healthy persons except by the aid of suggestion.