This paper was written at Zuñi in the summer of 1915. Its materials are limited and its interpretations avowedly tentative. It was not feasible to extend the scope of the essay without undertaking work that circumstances rendered impossible at the time. Nor did the range and nature of the materials dealt with appear to warrant a subsequent recasting in the light of the available published investigations relating to the subject. The paper is therefore presented as written at the time and on the spot, except for a brief postscript dealing with the literature and certain comparative data.
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