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shrieks of distress, he shot the serpent before the bird had reached it; still, however, the bird did not fly, and on taking it up, it was already dead, being killed either by fear or by the fascinating influence of the serpent, although upon measuring the ground he found the space between them to be not less than three feet and a half.

M. Acrell, in a very interesting paper upon this subject in the Swedish Amœnitates Academicæ,* contends that the coluber Berus, or common viper, is in some degree endowed with the same fascinating power as the rattlesnake. And there is a case much in point inserted in one of the early volumes of the Philosophical Transactions, which states that a mouse, put by way of experiment, into a cage in which a female viper was confined, appeared at first greatly agitated, and was afterwards seen to draw near to the viper gradually, which continued motionless, but with fixed eyes and distended mouth, and at length entered into its jaws, and was devoured.

There is, in truth, a secret kind of influence, but whether of the same kind or distinct from it, we have no means of ascertaining, which other animals possess on particular occasions, and which is even in some cases possessed by man, and is known to disarm the fury of the most enraged or vicious quadrupeds. This is peculiarly seen at times in the case of watchdogs, over whom some house-breakers have found out the secret of exercising so seductive and quieting a power, as to keep them in a profound silence while the burglary is committed. M. Lindecrantz, another interesting writer in the Amoenitates Academica of Sweden, tells us that the natives of Lapland and Dalarne are in possession of this secret generally, insomuch that they can instantly disarm the most furious dog, and oblige him to fly from them with all his usual signs of fear, such as dropping his tail, and suddenly becoming silent.†

Grooms are sometimes found possessed of a similar power over horses. Mr. Townsend, a clergyman of excellent character, and considerable learning, has a striking anecdote to this effect, in his account of James Sullivan, a native of the county which forms the subject of his pen. The man, an awkward, ignorant rustic of the lowest class, was by profession a horsebreaker, and generally nicknamed the whisperer, from its being vulgarly supposed that he obtained his influence over unruly horses by whispering to them. The actual secret of his fascinating power he kept entirely to himself, and it has died with him. His son, who is in the same occupation, knows nothing of it. But it was well known to every one that, however unbroken or vicious a horse, or even a mule, might be when brought to him, in the short space of half an hour he became altogether passive under his influence, and was not only entirely gentle and tractable, but in a very considerable degree continued so, though somewhat more submissive to himself than to others. There was a little mystery in his plan, but unquestionably no deceit. When sent for to tame an unruly horse, he ordered the stable door to be shut upon himself and the animal alone, and not to be opened till a given signal. This singular intercourse usually lasted for about half an hour; no bustle was heard, or violence seemingly had recourse to: but when the door was opened on the proper sign being given, the horse was always seen lying down, and the fascinator by his side, playing with him familiarly as a child with a puppy. "I once," says

Vol. vi. No. 112. Morsura Serpentum, 1762.

† Vol. iv. No. 53. Canis Familiaris, 1753,

Mr. Townsend," saw his skill tried on a horse that could never before be brought to stand for a smith to shoe him. The day after Sullivan's half hour lecture, I went, not without some incredulity, to the smith's shop, with many other curious spectators, when we were eye-witnesses of the complete success of his art. This, too, had been a troop-horse, and it was supposed, not without reason, that after regimental discipline had failed, no other would be found availing. I observed that the animal seemed afraid whenever Sullivan either spoke or looked at him."* In common cases, Mr. Townsend adds, even the mysterious preparation of a private interview was not necessary, the animal becoming tame at once. We have here, therefore, another instance of most extraordinary and instantaneous ascendancy of one animal being over another, without any manifest medium of action, which we are occasionally, but not often, called upon to witness. That it could not have been by force is clear; and though natural firmness and intrepidity may do much, they by no means appear to have been sufficient in the present case, and could, indeed, accomplish but little in the dark. Nor does there seem to be any mode of accounting for such a control so reasonable as that of a natural or artificial emanation from the fascinator, which we have already adverted to; and, if the last, obtained, perhaps, as in many of these instances, by illining or impregnating the person of the operator with the virtues of various plants unknown or little known to the rest of the world.

Thus far we may proceed safely upon the subject before us. But some theorizers have not rested satisfied here, and with much rhapsody of invention, have carried forward the same mysterious agency into the recesses of the intellect, and contended that it is by a similar kind of medium, or, sometimes, by a sort of elective attraction, operating invisibly through the moral world, as the imperceptible powers before us operate in the physical, that mind produces occasionally an instantaneous influence upon mind; whence, say they, we are at times impelled by a certain indescribable sympathy, to feel more pleased with one person of less intellectual and perhaps even less moral worth, than with another person, whose endowments in both respects are confessedly superior: whilst others, pursuing the hallucination still farther, have gravely suggested, that it is possibly by some such medium that an intercourse is occasionally maintained between ourselves and the spirits of our departed friends; between this world and worlds around us. To hunt down such vagaries would indeed be a thriftless employment; and I only mention them to show that philosophy has dreams and romances as well as history or even poetry; and that the principles of physics are as liable to perversion as those of ethics. Philosophy is a pilgrim, for the most part, of honest heart, clear foresight, and unornamented dress and manners; the genuine bride to whom heaven has bctrothed him is Reason, of celestial birth and spotless virginity; and the fair fruit of so holy a union is truth, virtue, sobriety, and order. But should ever the plain pilgrim play the truant, as unfortunately in the present corrupt state of things we have reason to fear has too frequently proved a fact, -should ever Philosophy migrate from his proper hermitage, and in an our of ebriety connect himself with the harlot Imagination, what can be e result of so unlicensed a dalliance but a spawn of monsters and missations; of hideous and unreal existences; of phantoms and will-o'theisps, equally abhorred by God and man; treacherously hanging up their

* Survey of the County of Cork, p. 438:

dim wild-fire, in the pestilent bosom of mists and exhalations, and from their murky shades alluring the incautious inquirer to bogs, and sloughs, and quagmires of wreck and ruin?



We are proceeding to a subject of much difficulty in theory, though of the greatest familiarity in fact; and I freely confess to you, that although I have endeavoured to investigate almost every opinion that has been offered upon it, from the time of Aristotle to our own day, I have never met with any thing in the least degree satisfactory, or capable of unravelling the perplexities in which it lies entangled.

What can possibly be more opposite to each other than the two states of wakefulness and sleep?-the senses in full vigour and activity, alive to every pursuit and braced up to every exertion, and a suspension of all sense whatever, a looseness and inertness of the voluntary powers, so nearly akin to death, that nothing but a daily experience of the fact itself could justify us in expecting that we could ever recover from it.

And yet, while such is the lifelessness without, the mind, now destitute of the control of the will, is often overwhelmed with a chaos of ideas, rushing upon each other with so much rapidity, that the transactions of ages are crowded into moments, and so confused and disjointed, that the wildest and most incongruous fancies flit before us, and every thing that is possible becomes united with every thing that is impossible.

Such, however, are the ordinary means devised by Infinite Wisdom to revivify the animal frame, when exhausted by the labours of the day; to recruit it for new exertions, and enable it to fill up the measure of its existence.

The order I shall take leave to pursue in discussing this abstruse subject will consist, first, in a brief examination of the more prominent hypotheses on sleep and dreaming that have been offered to us by ancient and modern schools: secondly, in a minute analysis of the feelings and phænomena by which these operations are characterized, agreeably to the series in which they occur; thirdly, in submitting the outline of a new theory to explain the entire process; and lastly, in an application of such theory to a variety of other subjects of a similar and equally extraordinary


Sleep may be either natural or morbid. The former is usually produced by whatever exhausts the principle of life; as great muscular excitement, violent pain, vehement use of the external senses; or great mental excitement, as intense thought, or severe distress. Morbid sleep is commonly occasioned by compression or commotion of the brain, and is hence often the result of congestion, plethora, or local injury to the skull.

Compression and commotion, though less frequent, are more direct and obvious causes and hence the greater number of physiologists believe compression to take place also, though in a slight degree, in every

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case of natural sleep; and in reality to constitute the immediate, whilst sensorial exhaustion only constitutes the remote, cause of this phænomenon. They appeal to the lethargic effect of a full stomach in infants, and of drunkenness in adults, which they refer to congestion in the brain, in consequence of a greater influx of blood into this organ: and hence they reason that a similar sort of pressure is produced by some means or other in every case of sleep.

But what are the means of pressure thus referred to? And here a considerable difficulty is felt by every school of physiologists: and two distinct schemes are devised to get rid of it. By the one we are directed to the arterial system, which we are told, becomes peculiarly excited and overcharged in the organ of the brain during wakefulness, from the activity of the internal senses. By the other we are directed to the absorbent system, which from the same activity is said to become worn out and rendered torpid in the same organ; and, hence, to be incapable of carrying off the fine fluid which is perpetually exhaling from the secernent vessels into the ventricles of the brain.

Nothing, however, can be more unfounded than both these conjectures, and it is difficult to determine which of the two is the most so. But we are in no want of either of them, for we are in no want of the pressure which they are invented to account for. The principle of exhaustion alone will, I trust, be found sufficient to answer every purpose as a general cause of natural sleep; and, were it possible for us to add that of local pressure, the sleep would no longer be natural, but inorbid.



Before we proceed further, however, I will just hint that Dr. Cullen supposes the nervous fluid or power to be disposed by nature to an alternating state of torpor and mobility.t. He does not admit that it exhausted and restored as a secretion; and hence in sleep it is only suspended and in consequence of this suspension the exercise of sense and volition is suspended also.§ Narcotics do not, therefore, in his view, haust, but only suspend the nervous power or fluid, and thus induce sleep, which consists in such suspension. The apparently stimulant power of narcotics, he derives from the vigilant exertion of the vis medicatrix naturæ,--the instinctive effort of nature, to guard against such suspension of vital power as essentially mischievous, and, when carried to an extreme, fatal: and hence, narcotics are with him directly sedative, but only indirectly stimulant. He supposes both sleep and waking to take place upon each other merely by a law of alternation: an explanation that will satisfy few.

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But the chief attention of physiologists, both ancient and modern, has been directed to the subject of dreaming, which has usually but erroneously been regarded as a distinct process from that of sleeping. Let us next, therefore, as briefly as may be, and before we enter into a direct analysis of the phænomena that successively arise, take a glance at a few of the conjectures by which dreaming has hitherto been accounted for.

Among the Greek philosophers we meet with two explanations that are

This explanation is partly, though not chiefly adopted by the author of the elaborate article on sleep, in Rees' Cyclopædia; and has since been fully embraced by Mr. Carmichael in his learned Essay on Dreaming. See Transactions of the association of Fellows, and Licentiates of the King's and Queen's College of Physicians in Ireland, vol. ii. p. 48. 8vo. 1819. Dubl. His explanation of dreaming is that of Gall and Spurzheim, which the reader will find adverted to subsequently.

† Materia Medica, ii. 226.

↑ Id. p. 223.

§ Id. p. 226.


worthy of notice; that of Epicurus, because of its ingenuity, and that of Aristotle, because it has descended to the present times.

According to the Epicurean hypothesis of sensation, all the organs of external sense are stimulated to their appropriate functions, by the friction of an effluvium or emanation thrown off from the body perceived. This doctrine, which still holds good, and is uniformly employed in modern times to explain the sense of taste and smell, was equally extended by Epicurus to those of sight and hearing: the former being supposed to depend upon an effluvium of exquisitely fine films, images or SPECIES, as they were technically called, perpetually issuing in every direction from every existing substance, somewhat in the manner in which snakes and grasshoppers cast off their skins annually, but almost infinitely finer, and altogether invisible. And as these rush against the eye, they were conceived to convey to it a perfect image of the object from which they are ejected. While sound was supposed to be excited in like manner by particles of a peculiar kind thrown off from the sonorous body, and rousing the ears by their appropriate stimulus.

These effluvia of every kind were conceived to be so exquisitely attenuate that they can pass, as light, heat, or electricity does, through a variety of solid bodies, without being destroyed in their passage. The effluvia or pellicles of vision were supposed not unfrequently to arise from the very bodies of those that have been long buried; and to be capable not only of transpiercing the soil in which they are inhumed, and of stimulating the organs of external sight, but of winding through the substance of the flesh, and of stimulating the soul itself in the interior of the animal frame, especially when in a state of sleep, in which the external sense is closed, or of deep abstraction, in which it is inattentive; and thus of presenting to the soul in its naked state, as it may be called, pictures of objects no longer in existence. And hence these philosophers with great ingenuity, though, as it now appears, with great incorrectness, undertook to solve many of the most difficult problems in nature; accounted for the casual appearance of spectres in the gloom of solitude and retirement, and directly unfolded to the world the "stuff that dreams are made of."

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It is needless to point out the errors of this system, for it has long sunk into disuse, never to rise again. And I shall therefore proceed to the rival hypothesis of Aristotle, which, though equally unfounded in fact, has been fortunate enough to descend to modern times, and to have met with very powerful advocates in M. Wolff* and M. Formey. It was the doctrine of Aristotle, that external sensations not only produce by their stimulus a variety of INTELLECTUAL FORMS or images in the sensory, somewhat similar to the ideas of Plato, and for all practical purposes not very dissimilar to what is meant by ideas in the present day, but that these forms or ideas are themselves capable of producing another set of forms or ideas, though of a more airy and visionary kind:

As every shadow has itself a shade.

And to this secondary set, these slighter and more attenuate pictures of things, he gave the name of PHANTASMS. In the opinion of this philosophe, dreams consist alone of these phantasms, or mere creatures of the imagination, first excited by some previous motion or sensation in the

* Psychol. Empir. sec. 123.

† Mem. de l'Acad. de Berlin, ii. 316.

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