Book II. Reality.
Chapter XXIII. Body and Soul.
...Nor is it, once more, even certain that the identities of soul and of body
coincide. We, I presume, are not sure that one soul might not have a succession of bodies. And, in any case, we certainly do not know that one organism can be organic to no more than one soul. There might be more than one psychical centre at one time within the same body, and several bodies might be organs to a higher unknown soul.
...It seems at best doubtful if in some cases the soul can be said to have continuous unity, or if it ought strictly to be called single. And then, finally, there remains the question, to which we shall return, whether an organism is necessary in all cases for the existence of a soul.