All mesmerically-produced phenomena are the consequence of the passes. The immediate effect of the passes is de-electrisation of the nerves, that is, of their contents, which leaves them polarised (as is the case in natural sleep), but more intensely than is effected by the comatose flow. In the ordinary condition, the contents of the nerves may be likened to milky water in a barometer tube; in natural sleep, to the same, with a less degree of milkiness--the latter subsiding from the ends to the middle portion of the water; and in the clairvoyant condition of the nerves, to the milkiness having so completely subsided as to leave the water above and below the middle of the tube transparent. In the ordinary condition, the nervous fluid is clogged, as it were, with intermixed electric matter, which, by marring the regular continuity of the fluid from without to the brain, reduces in some degree the exciting pressure on the brain, which prevents the function of the fluid being employed to its utmost. In this encumbered state, the fluid may be said to act on the brain, as the clapper when muffled on a bell. Still the excited pressure is sufficiently strong, and the mental result sufficiently distinct for all human purposes. When to the clairvoyant degree the nerves have been denuded of impeding electric matter, the nervous fluid is enabled to act on the brain as if unmuffled; and as its continuity from the orifices of the retina through space is not in any manner altered, so, to the altered electric condition, mesmerically effected, on the contents of the nerves between their orifices and the brain, we must attribute all mesmerically produced phenomena; and without supposing that the brain is quickened into a higher degree of sensibility, or that any one of its various organs has acquired some exalted degree of psychologic ability. That _long vision_ and _opaque vision_ should be consequences of cleansing, as it were, the nerves of intercepting minus-pressure matter, is nothing surprising, it is as removing dust from the window to better our vision: the physiology is traceable, and the psychology not more incomprehensible than its hourly occurrence in a minor degree, to which, as sensible effects, we are indebted for all we know, and by which we abide, without inquiry into their nature or origin; so perfect is the design of Nature in our make for supplying all that is requisite to the comfort and enjoyment of man in his present state of existence.