The phantom with the crutch was only a species of machinery, such as that with which fancy is found to supply the disorder called _Ephialtes_, or nightmare, or indeed any other external impression upon our organs in sleep, which the patient's morbid imagination may introduce into the dream preceding the swoon. In the nightmare an oppression and suffocation is felt, and our fancy instantly conjures up a spectre to lie on our bosom. In like manner it may be remarked, that any sudden noise which the slumberer hears, without being actually awakened by it--any casual touch of his person occurring in the same manner--becomes instantly adopted in his dream, and accommodated to the tenor of the current train of thought, whatever that may happen to be; and nothing is more remarkable than the rapidity with which imagination supplies a complete explanation of the interruption, according to the previous train of ideas expressed in the dream, even when scarce a moment of time is allowed for that purpose. In dreaming, for example, of a duel, the external sound becomes, in the twinkling of an eye, the discharge of the combatants' pistols;--is an orator haranguing in his sleep, the sound becomes the applause of his supposed audience;--is the dreamer wandering among supposed ruins, the noise is that of the fall of some part of the mass. In short, an explanatory system is adopted during sleep with such extreme rapidity, that supposing the intruding alarm to have been the first call of some person to awaken the slumberer, the explanation, though requiring some process of argument or deduction, is usually formed and perfect before the second effort of the speaker has restored the dreamer to the waking world and its realities. So rapid and intuitive is the succession of ideas in sleep, as to remind us of the vision of the prophet Mahommed, in which he saw the whole wonders of heaven and hell, though the jar of water which fell when his ecstasy commenced, had not spilled its contents when he returned to ordinary existence. A second, and equally remarkable instance, was communicated to the author by the medical man under whose observation it fell, but who was, of course, desirous to keep private the name of the hero of so singular a history. Of the friend by whom the facts were attested I can only say, that if I found myself at liberty to name him, the rank which he holds in his profession, as well as his attainments in science and philosophy, form an undisputed claim to the most implicit credit.