which the salt [which keeps them down] becomes dissolved. The

residuary movements are like these: they are within the soul

potentially, but actualize themselves only when the impediment to

their doing so has been relaxed; and according as they are thus set

free, they begin to move in the blood which remains in the sensory

organs, and which is now but scanty, while they possess verisimilitude

after the manner of cloud-shapes, which in their rapid metamorphoses

one compares now to human beings and a moment afterwards to

centaurs. Each of them is however, as has been said, the remnant of

a sensory impression taken when sense was actualizing itself; and when

this, the true impression, has departed, its remnant is still

immanent, and it is correct to say of it, that though not actually

Koriskos, it is like Koriskos. For when the person was actually

perceiving, his controlling and judging sensory faculty did not call

it Koriskos, but, prompted by this [impression], called the genuine

person yonder Koriskos. Accordingly, this sensory impulse, which, when

actually perceiving, it [the controlling faculty] describes (unless

completely inhibited by the blood), it now [in dreams] when

quasi-perceiving, receives from the movements persisting in the

sense-organs, and mistakes it-an impulse that is merely like the

true [objective] impression-for the true impression itself, while

the effect of sleep is so great that it causes this mistake to pass

unnoticed. Accordingly, just as if a finger be inserted beneath the

eyeball without being observed, one object will not only present two

visual images, but will create an opinion of its being two objects;

while if it [the finger] be observed, the presentation will be the

same, but the same opinion will not be formed of it; exactly so it

is in states of sleep: if the sleeper perceives that he is asleep, and

is conscious of the sleeping state during which the perception comes

before his mind, it presents itself still, but something within him

speaks to this effect: 'the image of Koriskos presents itself, but the

real Koriskos is not present'; for often, when one is asleep, there is