Where the transition from one state to another is complete, memory is entirely lost; but there are cases in which the change, being either gradual or modified, the recollections of one life are carried more or less into the other. We know this to be the case with magnetic sleepers, as it is with ordinary dreamers; and most persons have met with instances of the dream of one night being continued in the next. Treviranus mentions the case of a student who regularly began to talk the moment he fell asleep, the subject of his discourse being a dream, which he always took up at the exact point at which he had left it the previous morning. Of this dream he had never the slightest recollection in his waking state. A daughter of Sir George Mackenzie, who died at an early age, was endowed with a remarkable genius for music, and was an accomplished organist. This young lady dreamed, during an illness, that she was at a party, where she had heard a new piece of music, which made so great an impression on her by its novelty and beauty, that, on awaking, she besought her attendants to bring her some paper, that she might write it down before she had forgotten it—an indulgence which, apprehensive of excitement, her medical attendant unfortunately forbade; for, apart from the additional psychological interest that would have been attached to the fact, the effects of compliance, judging from what ensued, would probably have been soothing rather than otherwise. About ten days afterward, she had a second dream, wherein she again found herself at a party, where she descried on the desk of a pianoforte, in a corner of the room, an open book, in which, with astonished delight, she recognised the same piece of music, which she immediately proceeded to play, and then awoke. The piece was not of a short or fugitive character, but in the style of an overture. The question, of course, remains, as to whether she was composing the music in her sleep, or, by an act of clairvoyance, was perceiving some that actually existed. Either is possible, for, although she might have been incapable of composing so elaborate a piece in her waking state, there are many instances on record of persons performing intellectual feats in dreams, to which they were unequal when awake. A very eminent person assured me that he had once composed some lines in his sleep (I think it was a sonnet) which far exceeded any of his waking performances of that description.