Each totemic group has its own Intichiuma. Even if this rite is general in the societies of the centre, it is not the same everywhere; among the Warramunga, it is not what it is among the Arunta; it varies, not only among the tribes, but also within the tribe, among the clans. But it is obvious that the different mechanisms in use are too closely related to each other to be dissociated completely. There is no ceremony, perhaps, which is not made up of several, though these are very unequally developed: what exists only as a germ in one, occupies the most important place in another, and inversely. Yet they must be carefully distinguished, for they constitute just so many different ritual types to be described and explained separately, but afterwards we must seek some common source from which they were derived. Let us commence with those observed among the Arunta. I The celebration includes two successive phases. The object of the rites which take place in the first is to assure the prosperity of the animal or vegetable species serving the clan as totem. The means employed for this end may be reduced to two principal types. It will be remembered that the fabulous ancestors from whom each clan is supposed to be descended, formerly lived on earth and left traces of their passage there. These traces consist especially in stones and rocks which they deposited at certain places, or which were formed at the spots where they entered into the ground. These rocks and stones are considered the bodies or parts of the bodies of the ancestors, whose memory they keep alive; they represent them. Consequently, they also represent the animals and plants which served these same ancestors as totems, for an individual and his totem are only one. The same reality and the same properties are attributed to them as to the actually living plants or animals of the same species. But they have this advantage over these latter, that they are imperishable, knowing neither sickness nor death. So they are like a permanent immutable and ever-available reserve of animal and vegetable life. Also, in a certain number of cases, it is this reserve that they annually draw upon to assure the reproduction of the species. Here, for example, is how the Witchetty grub clan, at Alice Springs, proceeds at its Intichiuma.[1107] On the day fixed by the chief, all the members of the totemic group assemble in the principal camp. The men of the other totems retire to a distance;[1108] for among the Arunta, they are not allowed to be present at the celebration of the rite, which has all the characteristics of a secret ceremony. An individual of a different totem, but of the same phratry, may be invited to be present, as a favour; but this is only as a witness. In no case can he take an active part.