The construction of the first sweat house, or tachi, was begun at dawn. Four of these houses were built on four consecutive mornings, each one located about 400 feet distant from the great central medicine lodge, toward the four cardinal points, and all facing to the east. The first one built was east of the lodge. A description of the construction of this particular one will answer for all, but the ceremonies differ in detail. Four upright poles, forked at the upper ends, were placed at the four cardinal points within an area designated as the base of the house, the forked ends resting against each other, a circular excavation some 6 feet in diameter and 1 foot in depth having first been made. Between the uprights smaller poles were laid; on the poles piñon boughs, sage and _Bigelovia Douglasii_ (a kind of sage brush) were placed as a thatch; all being laid sufficiently compact to prevent the sand placed over the top from sifting through. The doorway, on the east side of the house, was about 2½ feet high and 20 inches wide. Highly polished sticks (the same as those employed in blanket weaving) were used to render the sand covering of the structure smooth. The sweat houses to the east and west had the rainbow painted over them. Those to the north and south were devoid of such decoration, because the song priest seldom completes his medicine in one ceremonial; and he chose to omit the songs which would be required if the bow ornamented the north and south sweat houses. Under the direction of the priest of the sweat house, who received instruction from the song priest, three young men painted the rainbow, one the head and body, another the skirt and legs, while the third painted the bow. The head of this goddess was to the north, the bow extending over the structure. The colors used were made from ground pigments sprinkled on with the thumb and forefinger. Whenever a pinch of the dry paint was taken from the pieces of bark which served as paint cups, the artist breathed upon the hand before sprinkling the paint. This, however, had no religious significance, but was merely to clear the finger and thumb of any superfluous sand. The colors used in decoration were yellow, red, and white from sandstones, black from charcoal, and a grayish blue, formed of white sand and charcoal, with a very small quantity of yellow and red sands. (See Fig. 118.) The decorators were carefully watched by the song priest. [Illustration: Fig. 118. Sweat house.]