However, it is incontestable that in this case the idea of an impersonal religious force is beginning to change; but there are other cases where it is affirmed in all its abstract purity and even reaches a higher degree of generality than in Australia. If the different totemic principles to which the various clans of a single tribe address themselves are distinct from each other, they are, none the less, comparable to each other at bottom; for all play the same rôle in their respective spheres. There are societies which have had the feeling of this unity with nature and have consequently advanced to the idea of a unique religious force of which all other sacred principles are only expressions and which makes the unity of the universe. As these societies are still thoroughly impregnated with totemism, and as they remain entangled in a social organization identical with that of the Australians, we may say that totemism contained this idea in potentiality. This can be observed in a large number of American tribes, especially those belonging to the great Sioux family: the Omaha, Ponka, Kansas, Osage, Assiniboin, Dakota, Iowa, Winnebago, Mandan, Hidatsa, etc. Many of these are still organized in clans, as the Omaha[620] and the Iowa;[621] others were so not long since, and, says Dorsey, it is still possible to find among them "all the foundations of the totemic system, just as in the other societies of the Sioux."[622] Now among these peoples, above all the particular deities to whom men render a cult, there is a pre-eminent power to which all the others have the relation of derived forms, and which is called _wakan_.[623] Owing to the preponderating place thus assigned to this principle in the Siouan pantheon, it is sometimes regarded as a sort of sovereign god, or a Jupiter or Jahveh, and travellers have frequently translated wakan by "great spirit." This is misrepresenting its real nature gravely. The wakan is in no way a personal being; the natives do not represent it in a determined form. According to an observer cited by Dorsey, "they say that they have never seen the wakanda, so they cannot pretend to personify it."[624] It is not even possible to define it by determined attributes and characteristics. "No word," says Riggs, "can explain the meaning of this term among the Dakota. It embraces all mystery, all secret power, all divinity."[625] All the beings which the Dakota reveres, "the earth, the four winds, the sun, the moon and the stars, are manifestations of this mysterious life and power" which enters into all. Sometimes it is represented in the form of a wind, as a breath having its seat in the four cardinal points and moving everything:[626] sometimes it is a voice heard in the crashing of the thunder;[627] the sun, moon and stars are wakan.[628] But no enumeration could exhaust this infinitely complex idea. It is not a definite and definable power, the power of doing this or that; it is Power in an absolute sense, with