Clark Wissler, The Sun Dance of the Blackfoot Indians
“ Thus, we have a custom of calling upon the sun in time of need which is an almost universal practice, a more restricted form of such appeal peculiar to women in so far that sexual morality is a necessary qualification, the more specific vow of "going forward to the tongues", and the exceptional vow to perform the medicine woman's functions at the sun dance, a fair illustration of the way in which most complex folk ceremonies are supported by a pyramid of less and less differentiated practices. ”
