On this theory the evolution of religion was, if we may so describe it, linear or rectilinear: the process consisted in a series of successive stages. In some cases, as for instance among the aborigines of Australia, it never rose higher than its starting-point, totemism; in others, as for instance in Samoa, it became polytheism without ceasing to be totemism; in others again, as for instance amongst the Aryan peoples, it became so completely polytheistic that even conjecture can discover but few indications or ‘survivals’ of the totemism from which it is supposed to have developed; and the polytheism of the Israelites was so completely superseded by monotheism that the very existence of an earlier stage of polytheism could be as strenuously denied in their case as the pre-existence of totemism could be denied amongst the polytheistic Aryans. Nevertheless the theory was that if we represent the growth of the various religions of the world diagrammatically by vertical lines parallel to one another but of various lengths, one line standing for totemism, a longer line for polydaemonism, a still longer one for polytheism, and the longest of all for monotheism, we should see that the line of growth has been the same in all cases, and that it is in their length, or (shall we say?) in their height alone that the various lines differ, and that the longest line culminates in monotheism only because it has been, so to speak, pulled out in the same way that a telescope when closed, may be extended. The evolution of religion on this view has been a process literally of ‘evolution’ or unfolding: the idea of a god and of communion with him has been present from the beginning; and, much though religion may have changed, it remains to the end essentially the same thing. This view of the process of religious evolution we may fairly term ‘the pre-formation theory’; for on this theory each stage is pre-formed in the stage immediately preceding it, and in the earliest stage of all were all succeeding stages contained pre-formed, though it depended on circumstances whether the seed should spring up, and how many stages of its growth it should accomplish.