Also, other facts of experience which affect the mind in the same way naturally group themselves around this fundamental fact taught by the dream: fainting, apoplexy, catalepsy, ecstasy, in a word, all cases of temporary insensibility. In fact, they all are explained very well by the hypothesis that the principle of life and feeling is able to leave the body momentarily. Also, it is natural that this principle should be confounded with the double, since the absence of the double during sleep daily has the effect of suspending thought and life. Thus diverse observations seem to agree mutually and to confirm the idea of the constitutional duality of man.[100] But the soul is not a spirit. It is attached to a body which it can leave only by exception; in so far as it is nothing more than that, it is not the object of any cult. The spirit, on the other hand, though generally having some special thing as its residence, can go away at will, and a man can enter into relations with it only by observing ritual precautions. The soul can become a spirit, then, only by transforming itself: the simple application of these preceding ideas to the fact of death produced this metamorphosis quite naturally. For a rudimentary intelligence, in fact, death is not distinguished from a long fainting swoon or a prolonged sleep; it has all their aspects. Thus it seems that it too consists in a separation of the soul and the body, analogous to that produced every night; but as in such cases, the body is not reanimated, the idea is formed of a separation without an assignable limit of time. When the body is once destroyed--and funeral rites have the object of hastening this destruction--the separation is taken as final. Hence come spirits detached from any organism and left free in space. As their number augments with time, a population of souls forms around the living population. These souls of men have the needs and passions of men; they seek to concern themselves with the life of their companions of yesterday, either to aid them or to injure them, according to the sentiments which they have kept towards them. According to the circumstances, their nature makes them either very precious auxiliaries or very redoubtable adversaries. Owing to their extreme fluidity, they can even enter into the body, and cause all sorts of disorders there, or else increase its vitality. Thus comes the habit of attributing to them all those events of life which vary slightly from the ordinary: there are very few of these for which they cannot account. Thus they constitute a sort of ever-ready supply of causes which never leaves one at a loss when in search of explanations. Does a man appear inspired, does he speak with energy, is it as though he were lifted outside himself and above the ordinary level of men? It is because a good spirit is in him and animates him. Is he overtaken by an attack or seized by madness? It is because an evil spirit has entered into him and