and its sacred character without falling into materialism. And it is true that if we have no idea of moral and religious imperatives, our psychical life will all be reduced to one level,[861] all our states of consciousness will be on the same plane, and all feeling of duality will perish. To make this duality intelligible, it is, of course, in no way necessary to imagine a mysterious and unrepresentable substance, under the name of the soul, which is opposed to the body. But here, as in regard to the idea of sacredness, the error concerns the letter of the symbol employed, not the reality of the fact symbolized. It remains true that our nature is double; there really is a particle of divinity in us because there is within us us a particle of these great ideas which are the soul of the group. So the individual soul is only a portion of the collective soul of the group; it is the anonymous force at the basis of the cult, but incarnated in an individual whose personality it espouses; it is _mana_ individualized. Perhaps dreams aided in determining certain secondary characteristics of the idea. The inconsistency and instability of the images which fill our minds during sleep, and their remarkable aptitude for transforming themselves into one another, may have furnished the model for this subtile, transparent and Protean matter out of which the soul is believed to be made. Also, the facts of swooning, catalepsy, etc., may have suggested the idea that the soul was mobile, and quitted the body temporarily during this life; this, in its turn, has served to explain certain dreams. But all these experiences and observations could have had only a secondary and complimentary influence, whose very existence it is difficult to establish. All that is really essential in the idea comes from elsewhere. But does not this genesis of the idea of the soul misunderstand its essential characteristic? If the soul is a particular form of the impersonal principle which is diffused in the group, the totemic species and all the things of every sort which are attached to these, at bottom it is impersonal itself. So, with differences only of degree, it should have the same properties as the force of which it is a special form, and particularly, the same diffusion, the same aptitude for spreading itself contagiously and the same ubiquity. But quite on the contrary, the soul is voluntarily represented as a concrete, definite being, wholly contained within itself and not communicable to others; it is made the basis of our personality.