Dr. Dyce, of Aberdeen, describes the case of a girl, in which this affection began with fits of somnolency, which came upon her suddenly during the day, and from which she could at first be roused by shaking or by being taken into the open air. During these attacks she was in the habit of talking of things that seemed to pass before her like a dream, and was not at the time sensible of any thing that was said to her. On one occasion she repeated the entire of the baptismal service of the Church of England, and concluded with an extemporary prayer. In her subsequent paroxysms she began to understand what was said to her, and to answer with a considerable degree of consistency, though these replies were in a certain measure influenced by her hallucination. She also became capable of following her usual employment during the paroxysm. At one time she would lay out the table for breakfast, and repeatedly dress herself and the children, her eyes remaining shut the whole time. The remarkable circumstance was now discovered, that, during the paroxysm, she had a distinct recollection of what had taken place in former attacks, though she had not the slightest recollection of it during the intervals. She was taken to church during the paroxysm, and attended the service with apparent devotion, and at one time was so affected by the sermon that she actually shed tears; yet in the interval she had no recollection whatever of the circumstance, but in the following paroxysm she gave a most distinct account of it, and actually repeated the passage of the sermon that had so much affected her. This sort of somnambulism, relating distinctly to two periods, has been called, perhaps erroneously, a _state of double consciousness_. This girl described the paroxysm as coming on with a dimness of sight and a noise in the head. During the attack, her eyelids were generally half shut, and frequently resembled those of a person labouring under amaurosis, the pupil dilated and insensible. Her looks were dull and vacant, and she often mistook the person who was speaking to her. The paroxysms usually lasted an hour, but she often could be roused from them. She then yawned and stretched herself like a person awakening from sleep, and instantly recognised those about her. At one time Dr. Dyce affirms, she read distinctly a portion of a book presented to her, and she would frequently sing pieces of music more correctly and with better taste than when awake.