It is impossible to prove, historically, which of the two main elements in belief--the idea of an Eternal Being or Beings, or the idea of surviving ghosts--came first into the minds of men. The idea of primeval Eternal Beings, as understood by savages, does not depend on, or require, the ghost theory. But, as we almost always find ghosts and a Supreme Being together, where we find either, among the lowest savages, we have no historical ground for asserting that either is prior to the other. Where we have no evidence to the belief in the Maker, we must not conclude that no such belief exists. Our knowledge is confused and scanty; often it is derived from men who do not know the native language, or the native sacred language, or have not been trusted with what the savage treasures as his secret. Moreover, if anywhere ghosts are found without gods, it is an inference from the argument that an idea familiar to very low savage tribes, like the Australians, and falling more and more into the background elsewhere, though still extant and traceable, might, in certain cases, be lost and forgotten altogether. To take an example of half-forgotten deity. Mr. Im Thurn, a good observer, has written on 'The Animism of the Indians of British Guiana.' Mr. Im Thurn justly says: 'The man who above all others has made this study possible is Mr. Tylor.' But it is not unfair to remark that Mr. Im Thurn naturally sees most distinctly that which Mr. Tylor has taught him to see--namely, Animism. He has also been persuaded, by Mr. Dorman, that the Great Spirit of North American tribes is 'almost certainly nothing more than a figure of European origin, reflected and transmitted almost beyond recognition on the mirror of the Indian mind,' That is not my opinion: I conceive that the Red Indians had their native Eternal, like the Australians, Fijians, Andamanese, Dinkas, Yao, and so forth, as will be shown later. Mr. Im Thurn, however, dilates on the dream origin of the ghost theory, giving examples from his own knowledge of the difficulty with which Guiana Indians discern the hallucinations of dreams from the facts of waking life. Their waking hallucinations are also so vivid as to be taken for realities.[25] Mr. Im Thurn adopts the hypothesis that, from ghosts, 'a belief has arisen, but very gradually, in higher spirits, and, eventually, in a Highest Spirit; and, keeping pace with the growth of these beliefs, a habit of reverence for and worship of spirits.' On this hypothesis, the spirit latest evolved, and most worshipful, ought, of course, to be the 'Highest Spirit.' But the reverse, as usual, is the case. The Guiana Indians believe in the continued, but not in the everlasting, existence of a man's ghost.[26] They believe in no spirits which were not once tenants of material bodies.[27]