The early pottery was largely black-on-yellow, but some polychrome ware was made, and there was also plain cooking pottery and some corrugated. The latter became progressively less widely used, and later cooking ware is almost entirely plain. In some later sites some of the black-on-yellow ware is marked by a distinctive stippling technique as black paint was splattered over the yellow background. During the period from 1400 to 1625 some of the most beautiful pottery ever made in the Southwest was being produced in the Hopi country. This is a polychrome ware which bears exceptionally fine designs, which include geometric and life forms and particularly graceful patterns, applied in red and black paint on a yellow background. Over forty years ago, archaeologists were excavating ancient villages in the Hopi country and finding examples of this beautiful ware. A woman of the village of Walpi, named Nampeyo, was the wife of one of the workmen employed by the expedition. She was already a fine potter, and she recognized the great artistry represented by these ancient vessels. She began to use similar designs and continued to produce remarkably fine pottery for over thirty years, although, for much of that time, her sight was failing and eventually she became blind, and the final painting of the graceful vessels which she had shaped had to be entrusted to others. The influence of this talented woman can still be seen in the fine pottery made by Hopi women of the First Mesa. [Illustration: Fig. 36—Cavate dwellings and talus houses at Bandelier National Monument, New Mexico. (Courtesy National Park Service.)] In the Zuñi district houses and kivas were much like those of the Hopi country. Pottery in this area was largely decorated with glaze paints. These are vitreous mixtures obtained by the use of lead in the paint. Glaze paints were difficult to apply and had a tendency to run or settle in masses. As a result, designs were poor, but the use of glazes was confined to decorations and entire vessels were not covered. In the Rio Grande drainage, people with an earlier Pueblo culture were just beginning to come together into large communities when this period began. Doubtless, the advent of people from other parts of the Plateau province did much to intensify this trend. As time went by, houses became larger and fewer in number. Tuff blocks and adobe were widely used in their construction and there was some use of _cavate_ dwellings. These are rooms, excavated into the back walls of caves, which have porchlike chambers in front.