These are the most ordinary symptoms, and such as generally happen in almost all paroxysms of Night-Mare; there are, however, other symptoms which occasionally occur, and which sometimes cause no small alarm to the patient. It frequently happens too, that the paroxysm goes off without the patient waking, and in that case is productive of strange hallucination to the person who is not accustomed to these paroxysms. It is by no means an uncommon thing for the person labouring under Night-Mare to see, or at least to imagine that he sees, some figure, either human, or otherwise, standing by him, threatening him, or deriding, or oppressing him. This circumstance has been productive of considerable misapprehensions and mistakes, not only with persons of weak minds, but likewise with those whose intellectual faculties have been greatly improved.--These visions are various, as are likewise the senses which become thus hallucinated; not only the sight, but the hearing, and the touch, are frequently imposed on. These hallucinations have so often occurred to myself, that they have long been rendered quite familiar, although they are still sometimes productive of very laughable mistakes. As they are more frequently, however, of the terrific cast, they act very powerfully on the minds of those who are not acquainted with them, and produce terrors which I verily believe sometimes prove fatal. I shall give some instances of these kinds of visions which I have had from the most indubitable authority, and I do not doubt but that many readers will find in their own recollections a number of circumstances apparently incredible, which will easily admit of the same solution. I must first premise, that the degree of consciousness during a paroxysm of Night-Mare is so much greater than ever happens in a dream, that the person who has had a vision of this kind cannot easily bring himself to acknowledge the deceit, unless, as often happens, he wakes out of the paroxysm, and finds himself in a very different place to what he must have been in for such a transaction to have occurred. When however, all the circumstances of time and place concur with the vision, which sometimes happens, and the patient does not wake in the paroxysm, but continues asleep for some time after, the transactions which occurred during the paroxysm of Night-Mare, and those of the dreams which took place during profound sleep are so very different as to the impression they have left on the sensorium, that there is no possibility of confounding them with one another. Indeed I know no way which a man has of convincing himself that the vision which has occurred during a paroxysm of Night-Mare, (if it be consistent in point of time and place,) is not real, unless he could have the evidence of other persons to the contrary who were present, and awake at the time, or that these hallucinations were rendered familiar to him by frequent repetition. I