manor-house, than the former delusion returned in full force: the green figurantés, whom the patient's depraved imagination had so long associated with these moveables, came capering and frisking to accompany them, exclaiming with great glee, as if the sufferer should have been rejoiced to see them, "Here we all are—here we all are!" The visionary, if I recollect right, was so much shocked at their appearance, that he retired abroad, in despair that any part of Britain could shelter him from the daily persecution of this domestic ballet.

There is reason to believe that such cases are numerous, and that they may perhaps arise not only from the debility of stomach brought on by excess in wine or spirits, which derangement often sensibly affects the eyes and sense of sight, but also because the mind becomes habitually predominated over by a train of fantastic visions, the consequence of frequent intoxication; and is thus, like a dislocated joint, apt again to go wrong, even when a different cause occasions the derangement.

It is easy to be supposed that habitual excitement by means of any other intoxicating drug, as opium, or its various substitutes, must expose those who practise the dangerous custom to the same inconvenience. Very frequent use of the nitrous oxide which affects the senses so strongly, and produces a short but singular state of ecstasy, would probably be found to occasion this species of disorder. But there are many other causes which medical men find attended with the same symptom, of embodying before the eyes of a patient imaginary illusions which are visible to no one else. This persecution of spectral deceptions is also found to exist when no excesses of the patient can be alleged as the cause, owing, doubtless, to a deranged state of the blood or nervous system.

The learned and acute Dr. Ferriar of Manchester was the first who brought before the English public the leading case, as it may be called, in this department, namely, that of Mons. Nicolai, the celebrated bookseller of Berlin. This gentleman was not a man merely of books, but of letters, and had the moral courage to lay before the Philosophical Society of Berlin an account of his own sufferings, from having been, by disease, subjected to a series of spectral illusions. The leading circumstances of this case may be stated very shortly, as it has been repeatedly before the public, and is insisted on by Dr. Ferriar, Dr. Hibbert, and others who have assumed Demonology as a subject. Nicolai traces his illness remotely to a series of disagreeable incidents which had happened to him in the beginning of the year 1791. The depression of spirits which was occasioned by these unpleasant occurrences, was aided by the consequences of neglecting a course of periodical bleeding which he had been accustomed to observe. This state of health brought on the disposition to see phantasmata, who visited, or it may be more properly said frequented, the apartments of the learned bookseller, presenting crowds of persons who moved and acted before him, nay, even spoke to and addressed him. These phantoms afforded nothing unpleasant to the imagination of the visionary either in sight or expression, and the patient was possessed of too much firmness to be otherwise affected by their presence than with a species of curiosity, as he remained convinced from the beginning to the end of the disorder, that these singular effects were merely symptoms of the state of his health, and did not in any other respect regard them as a subject of apprehension. After a certain time, and some use of medicine, the phantoms became less distinct in their outline, less vivid in their colouring, faded, as it were, on the eye of the patient, and at length totally disappeared.

The case of Nicolai has unquestionably been that of many whose love of science has not been able to overcome their natural reluctance to communicate to the public the particulars attending the visitation of a disease so peculiar. That such illnesses have been experienced, and have ended fatally, there can be no doubt; though it is by no means to be inferred, that the symptom of importance to our present discussion has, on all occasions, been produced from the same identical cause.

Dr. Hibbert, who has most ingeniously, as well as philosophically, handled this subject, has treated it also in a medical point of view, with science to which we make no pretence, and a precision of detail to which our superficial investigation affords us no room for extending ourselves.

The visitation of spectral phenomena is described by this learned gentleman as incidental to sundry complaints; and he mentions, in particular, that the symptom occurs not only in plethora, as in the case of the learned Prussian we have just mentioned, but is a frequent hectic symptom—often an associate of febrile and inflammatory disorders—frequently accompanying inflammation of the brain—a concomitant also of highly excited nervous irritability—equally connected with hypochondria—and finally united in some cases with gout, and in others with the effects of excitation produced by several gases. In all these cases there seems to be a morbid degree of sensibility, with which this symptom is ready to ally itself, and which, though inaccurate as a medical definition, may be held sufficiently descriptive of one character of the various kinds of disorder with which this painful symptom may be found allied.

A very singular and interesting illustration of such combinations as Dr. Hibbert has recorded of the spectral illusion with an actual disorder, and that of a dangerous kind, was frequently related in society by the late learned and accomplished Dr. Gregory of Edinburgh, and sometimes, I believe, quoted by him in his lectures. The narrative, to the author's best recollection, was as follows:—A patient of Dr. Gregory, a person, it is understood, of some rank, having requested the doctor's advice, made the following extraordinary statement of his complaint. "I am in the habit," he said, "of dining at five, and exactly as the hour of six arrives I am subjected to the following painful visitation. The door of the room, even when I have been weak enough to bolt it, which I have sometimes done, flies wide open; an old hag, like one of those who haunted the heath of Forres, enters with a frowning and incensed countenance, comes straight up to me with every demonstration of spite and indignation which could characterize her who haunted the merchant Abudah in the Oriental tale; she rushes upon me, says something, but so hastily that I cannot discover the purport, and then strikes me a severe blow with her staff. I fall from my chair in a swoon, which is of longer or shorter endurance. To the recurrence of this apparition I am daily subjected. And such is my new and singular complaint." The doctor immediately asked whether his patient had invited any one to sit with him when he expected such a visitation. He was answered in the negative. The nature of the complaint, he said, was so singular, it was so likely to be imputed to fancy, or even to mental derangement, that he had shrunk from communicating the circumstance to any one. "Then," said the doctor, "with your permission, I will dine with you to-day, téte-à-téte, and we will see if your malignant old woman will venture to join our company." The patient accepted the proposal with hope and gratitude, for he had expected ridicule rather than sympathy. They met at dinner, and Dr. Gregory, who suspected some nervous disorder, exerted his powers of conversation, well known to be of the most varied and brilliant character, to keep the attention of his host engaged, and prevent him from thinking on the approach of the fated hour, to which he was accustomed to look forward with so much terror. He succeeded in his purpose better than he had hoped. The hour of six came almost unnoticed, and it was hoped might pass away without any evil consequence; but it was scarce a