Sound sleep will often be broken by pain or uneasiness occurring in a particular part of the body; the dream will then often bear an instructive reference to the seat and nature of such pain. If cramp has attacked any of the limbs, or the head has been long confined back, the dream may be enlivened by some analogous tortures in the dungeon of the Inquisition; and it is curious, that a waking wish for some relief from unpleasant sensations will be _re_-excited in the dream,—a _dreamy fulfilment_. Captain Back, during one of the Arctic expeditions, when nearly in a state of starvation, often dreamed of indulging in _a delicious repast_. And Professor Stewart thus writes,—“I have been told by a friend, that, having occasion to apply a bottle of hot water to his feet, he dreamed that he was making a journey to the top of Mount Ætna, and that he found the heat of the ground insupportable. Another, having a blister applied to the head, dreamed that he was _scalped_ by a party of Indians.” If on these occasions we are warm in bed, our dreams will be often pleasing, and the scenes in the tropics; if _cold_, or chilly, the reverse, and we shall believe ourselves in Zembla. Holcroft had been musing on the probabilities of life and death, and one night went in pain to bed. He dreamed his body was severed above his hips, and again joined in a surprising manner. He was astonished to think he was alive, and afraid of being struck, lest the parts should be dissevered. Tempests heard in a slumber will be often associated with a dream of shipwreck; and some persons will dream of their having given pain to, or injured, others: they wake, and find some close analogy to _their own_ sensations. It is recorded that Cornelius Rufus dreamed that he was blind, and _so_ indeed _he awoke_. In other cases, we have the _double touch_, as it is termed; dreams of forcible detention occur, and the sleeper has found that he had with one hand tightly grasped the other. If this hand had been _moved in sleep_ unconsciously, the dream, no doubt, would have been essentially changed. And thus we have all the phenomena realised, which Shakspere has referred to in the visitations of his incorrigible Mab. Elliston was always awaked by nightmare when sleeping in a strange bed. As in some persons, by submitting the body to certain impressions during sleep, associated dreams may be produced at pleasure; so if the body or legs hang over the side of a bed, we may instantly dream of falling from a precipice: and it is curious that, under these illusions, we awake when we are past hope and our despair is at its height: in falling, at the moment we are about to be dashed to atoms; and, in drowning, when the last bubbles are gurgling in the throat. When we read in the Bodleian, Astrophel, I will point you to other curious experiments of this sort, by M. de Buzareingries.