A study of characteristic features in these so-called sand pictures of the Navajos would seem to indicate a Pueblo origin of the art, this notwithstanding the fact that it is to-day more highly developed or at least more extensively practiced amongst the Navajos than now, or perhaps ever, amongst the Pueblos. When, during my first sojourn with the Zuñi, I found this art practice in vogue among the tribal priest magicians and members of cult societies, I named it dry or powder painting. I could see at a glance that this custom of powder painting had resulted from the effort to transfer from a vertical, smooth, and stable surface, which could be painted on, to a horizontal and unstable surface, unsuited to like treatment, such symbolic and sacramental pictographs as are painted on the walls of the kivas, temporarily, as appurtenances to the dramaturgic ceremonials of the cult societies, and as supposed aids to the magical incantations and formulæ of all the monthly, semiannual, and quadrennial observances and fasts of the tribal priests; sometimes, also, in the curative or “Betterment” ceremonials of these priests. It is noteworthy that, with the exception of the invariable “Earth terrace,” “Pathway of (earth) life,” and a few other conventional symbols of mortal or earthly things (nearly always made of scattered prayer meal), powder painting is resorted to amongst the Zuñi only in ceremonials pertaining to _all_ the regions or inclusive of the _lower_ region. In such cases paintings typical of the North, West, South, and East are made on the four corresponding walls of the kiva, whilst the lower region is represented by appropriately powder or paint colored sand on the floor, and the upper region either by paintings on the walls near the ceiling or on stretched skins suspended from the latter. Thus the origin of the practice of floor powder painting may be seen to have resulted from the effort to represent with more dramatic appropriateness or exactness the lower as well as the other sacramental regions, and to have been incident to the growth from the quaternary of the sextenary or septenary system of world division so characteristic of Pueblo culture. Hence it is that I attribute the art of powder or sand painting to the Pueblos, and believe that it was introduced both by imitation and by the adoption of Pueblo men amongst the Navajos. Its greater prevalence amongst them to-day is simply due to the fact that having, as a rule, no suitable vertical or wall surfaces for pictorial treatment, all their larger ceremonial paintings have to be made on the ground, and can only or best be made, of course, by this means alone.