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Rh under Mythology, myths do seem to have carried a few mythical conceptions from the Old World to the New, but these have remained as mere parts of tales and do not function in practical life.

Hence, the general condition for any interpretation of Old and New World relations is the full recognition that their great culture centers were well isolated by a complex chain of wilder hunting peoples and that direct contact between the two was impossible without modern means of transportation. Only such traits could, therefore, filter through from one to the other as were assimilated by these more primitive tribes. When we consider their great number and the diversity of their speech, we realize that Mexico was completely isolated from China in agriculture, 'metal work, and similar arts, but not necessarily so in simpler traits like the sinew-backed bow. The proof of independent development thus rests largely in chronological and environmental relations.

The age-societies of the Plains Indians of North America are an illustration of this point. The only other places in the world where they exist seem to be in Melanesia and eastern Africa. In each case they have a restricted distribution. What, then, shall be said of this case? If similarity in culture is in itself evidence of common or genetic origin, then these peoples must have been in contact with each other. But there are no reasons for believing that they ever were in contact. Yet, there are those who would regard these societies as survivals of a time when all the world had them as a part of its culture. Now the best way to approach this assumption is to appeal to chronology. These societies in America have been thoroughly studied; yet, none of the recorded facts favors their antiquity of origin. In fact, a few Plains tribes are known to have acquired some of these societies within a century and for the phenomenon as a whole, 500 to 700 years seems a liberal estimate of its age. But what chances had these tribes to meet the Melanesian or the Masai of Africa during this period? Further, this age-grading system in America can be identified with one group of villages in the heart of the Plains area, from whom it was borrowed by the other