The sense of touch seems less liable to perversion than either that of sight or smell, nor are there many cases in which it can become accessary to such false intelligence as the eye and ear, collecting their objects from a greater distance and by less accurate enquiry, are but too ready to convey. Yet there is one circumstance in which the sense of touch as well as others is very apt to betray its possessor into inaccuracy, in respect to the circumstances which it impresses on its owner. The case occurs during sleep, when the dreamer touches with his hand some other part of his own person. He is clearly, in this case, both the actor and patient, both the proprietor of the member touching, and of that which is touched; while, to increase the complication, the hand is both toucher of the limb on which it rests, and receives an impression of touch from it; and the same is the case with the limb, which at one and the same time receives an impression from the hand, and conveys to the mind a report respecting the size, substance, and the like, of the member touching. Now, as during sleep the patient is unconscious that both limbs are his own identical property, his mind is apt to be much disturbed by the complication of sensations arising from two parts of his person being at once acted upon, and from their reciprocal action; and false impressions are thus received, which, accurately enquired into, would afford a clew to many puzzling phenomena in the theory of dreams. This peculiarity of the organ of touch, as also that it is confined to no particular organ, but is diffused over the whole person of the man, is noticed by Lucretius:-- "Ut si forte manu, quam vis jam corporis, ipse Tute tibi partem ferias, reque experiare." A remarkable instance of such an illusion was told me by a late nobleman. He had fallen asleep, with some uneasy feelings arising from indigestion. They operated in their usual course of visionary terrors. At length they were all summed up in the apprehension that the phantom of a dead man held the sleeper by the wrist, and endeavoured to drag him out of bed. He awaked in horror, and still felt the cold dead grasp of a corpse's hand on his right wrist. It was a minute before he discovered that his own left hand was in a state of numbness, and with it he had accidentally encircled his right arm.