plastic, this proceeding caused them to grow thinner, consequently
larger, thereby to loosen from the basket over which they had been
molded. As a result of this scraping, however, the corrugated surface
was destroyed, nor could it easily be restored. Therefore bowls when
made deep were, as a rule, smooth on the outside as well as on the
interior surface. When by a perfectly natural sequence of events--as
will be shown further on--ornamentation by painting came to be applied
first to the plain interiors of the bowls, the smooth outer surface
was found preferable to the corrugated surface, not only because it
took paint more readily, but also because the bowl, when painted
outside as well as inside, formed a far handsomer utensil for
household use than if simply decorated by the older methods. As a
consequence, we find that, while the larger vessels continued to be
corrugated and indented, the smoothed and painted bowl came into
general use. Associated later on with this secondary type of bowls
occurred the larger vessels plain at the bottoms, still corrugated at
the sides. Nor is this surprising, as the bowl, molded on the basket
bottom and there smoothed, could be afterward built up by the spiral
process. When in time the huge hemispherical canteens or water
carriers of earthen-ware replaced the basket bottles, so also the
water jar or _olla_ replaced the handled sitter or pitcher, since it
could be made larger to receive more copious supplies of water than
the strength of the frail handles on the pitchers would warrant.

[Illustration: FIG. 525.--Ancient bowl of corrugated ware.]

The water jar, like the food-bowl, is a conspicuous household article;
for which reason the Zuñi woman expends all her ability to render them
handsome. Judging by this, the desire to decorate the water-vessel
with paint, like its constant companion the food-bowl, would early