than anything else, distributed in the several rooms. We scarcely expected to witness a repetition of the events of the preceding night, for the soldiers had gone to sleep, reassured by the presence of their officers, who remained awake. But about one o’clock, in all the rooms at the same time, the cries of the previous night were repeated, and again the soldiers rushed out to escape the suffocating embrace of the big black dog. We had all remained awake, watching eagerly for what might happen, but, as may be supposed, we had seen nothing. “The enemy’s fleet having disappeared, we returned next day to Palmi. Since that event we have marched through the Kingdom of Naples in all directions and in all seasons, but the phenomena have never been reproduced. We are of opinion that the forced march which the troops had been obliged to make during a very hot day, by fatiguing the organs of respiration, had weakened the men, and consequently disposed them to experience these attacks of nightmare. The constrained position in which they were obliged to lie, the fact of their being undressed, and the bad air they were obliged to breathe, doubtless aided in the production.” A gentleman was, not long since, under my professional charge who was very subject to attacks of nightmare. Though remarkable for his personal courage, he confessed that during his paroxysms he was the most arrant coward in the world. Indeed, so powerful an impression had his frequent frightful dreams made upon him, that he was afraid to go to sleep, and would often pass the night engaged in some occupation calculated to keep him awake. The dreams which he had were always of such a character as to inspire terror, and generally related to demons and strange animals, which seated themselves on his chest, and tried to tear open his throat. They came on a few minutes after he fell asleep, and lasted sometimes for more than an hour. During their continuance he remained perfectly still and quiet, giving no evidence of the tumult within, beyond the appearance of a cold sweat over the whole surface of the body. When he awoke, as he always did when the climax was reached, he started from the bed with a bound, and with all the evidences of intense fright. After that he was safe for the remainder of the night. I am acquainted with another case in which there are no very obvious physical symptoms.