Naturally it might be questioned, why the body should become somnolent daily; and, by what means the comatose flow is naturally effected;--of itself it could not take place. The languor removed, and renovation of muscular strength through sleep, may satisfy in the first instance. Next, it would seem, that, as the functions of the several organs depend on the presence of minus-pressure matter for unequalising the pressure on each organ, so must there be waste, loss, and daily deficit of minus-pressure matter; which, from being made good by means of sleep, leaves it inferable, that the daily quantity derived from respiration may be little more than sufficient for the continuance of animation under the minimum of bodily exercise; but as man is necessitated to follow laborious avocations, so is it designed, that the loss by service and waste shall be the means whereby the necessary re-supply is to be furnished. The loss leaves the extremities polarized; and as greater waste towards total exhaustion approaches, the matter of the comatose flow becomes needed and is employed in prolonging the functions of the different organs, and before exhaustion is complete the body is in the state of sleep; during which, from every inspiration being far more lengthy than ordinary, the body is resupplied to repletion with the respirable minus-pressure matter, by which the extremities are depolarized, and the sleeper is awake, refreshed and invigorated. From which it may be said, that a man toils himself to sleep, and sleeps himself awake; and that, not "balmy sleep," but respiration, is "tired Nature's sweet restorer." _Mesmeric sleep_ may be considered forced sleep. It is effected with little or no comatose flow, which renders replenishing by long breathing unnecessary; and the patient, on being awakened by demagnetising the extremities, is rather debilitated than refreshed. Every finger of the mesmeriser is a magnet to the magnetic correlatives within the extremities of the patient; and the passes polarize after the manner of the comatose flow in the case of natural sleep. From there being no mesmerically-effected comatose flow, there is reason to infer, that _the contents of the nerves of sensation only are what the passes polarize_ and what only are polarized in natural sleep, although expressed by the word, _extremities_. Repetition of the passes separates, or de-electrises more completely the nerves of the extremities, than for the production of natural sleep is requisite. Hence it may be said, that the body of the _mesmerised_ patient is in magnetic advance, and hence the series of surprising consequences which bring to light more and more the wonders of the economy.