Although the medium of space is continuous through all bodies, the regular continuity is impaired by the elements of the atmosphere between each. The atmosphere not only protects all living bodies against the maximum and all excess of pressure, but in some considerable degree insulates the bodies of persons from each other, just as fog and small snow intercept the visual continuity and would render "rays of light" interruptedly continuous; so do the intermixed atoms of the atmosphere the regular continuity of the medium of space between person and person, as respects surfaces. Within the body, insulation is still more complete: here, electric matter and air abound to the exclusion of all excess of medium of space; by which the different organs remain, in a manner disconnected, or so far, as that the functional action of each organ has its distinct period, instead of the action of the whole being simultaneously performed. Beside these means and degrees of insulation, the non-conducting coating and lining of the nerves insulate more completely their elementary contents, by which the nerves are not only tubes of separation but insulation, and are direct conducting channels of the nervous fluid through the body from its external source to the brain. Although man is thus isolated from man, the isolating means do not prevent the medium of space being continuous through all, and from one to another; which is manifested by the clairvoyant, who has the like of the sensation excited in the brain of the mesmeriser repeated or excited in his own brain; as when the mesmeriser masticates and the sensation of the same flavour is known by the mesmerised. The sensation is nothing transferable; taste is not by the tongue; hence, by the sensation being excited in succession in the brain of each person, is the only conceivable mode, in reason, why the second should know what the first is masticating. The nervous fluid of the two may be supposed to be derived from the medium of space between them; then, by the medium of space lying between, the nervous fluids of the two are rendered continuous one with the other, and is so at all times, but only when the nervous fluid is mesmerically de-electrised is it productive of clairvoyant perceptions. Community of sensation, or the _same_ sensation being perceived by different persons, is an impossibility. The first sensation is only where it has been excited, in the brain of the mesmeriser; and supposing the matter of the nervous fluid continuous direct from his brain to that of the patient, in it, what has the latter to perceive?--nothing; neither is perception separable in idea from the result of cerebral excitement. It is to be hoped that the desultory ideas here advanced may tend to a better knowledge on this singular mesmeric discovery. Even the foregoing may be objected to with apparent reason, on consideration of what is termed "community of thought," wherein there is no previous sensation to be repeated.