This has been definitely proved by the observations of Strehlow. Spencer and Gillen cited only certain isolated cases of associated totems.[475] Strehlow has shown that this is in reality an absolutely general organization. He has been able to draw up a table where nearly all the totems of the Arunta are classified according to this principle: all are attached, either as associates or as auxiliaries, to some sixty principal totems.[476] The first are believed to be in the service of the second.[477] This state of dependence is very probably the echo of a time when the "allies" of to-day were only sub-totems, and consequently when the tribe contained only a small number of clans subdivided into sub-clans. Numerous survivals confirm this hypothesis. It frequently happens that two groups thus associated have the same totemic emblem: now this unity of emblem is explicable only if the two groups were at first only one.[478] The relation of the two clans is also shown by the part and the interest that each one takes in the rites of the other. The two cults are still only imperfectly separated; this is very probably because they were at first completely intermingled.[479] Tradition explains the bonds which unite them by imagining that formerly the two clans occupied neighbouring places.[480] In other cases, the myth says expressly that one of them was derived from the other. It is related that at first the associated animal belonged to the species still serving as principal totem; it differentiated itself at a later period. Thus the chantunga birds, which are associated with the witchetly grub to-day, were witchetly grubs in fabulous times, who later transformed themselves into birds. Two species which are now attached to the honey-ant were formerly honey-ants, etc.[481] This transformation of a sub-totem into a totem goes on by imperceptible degrees, so that in certain cases the situation is undecided, and it is hard to say whether one is dealing with a principal totem or a secondary one.[482] As Howitt says in regard to the Wotjobaluk, there are sub-totems which are totems in formation.[483] Thus the different things classified in a clan constitute, as it were, so many nuclei around which new totemic cults are able to form. This is the best proof of the religious sentiments which they inspire. If they did not have a sacred character, they could not be promoted so easily to the same dignity as the things which are sacred before all others, the regular totems.