and Kiowa, were generally portable skin tents or _tipis_, but those of the Omaha, Osage, and some others were more substantial. The dwellings of the Omaha, according to Miss Fletcher, 'are built by setting carefully selected and prepared posts together in a circle, and binding firmly with willows, then backing them with dried grass, and covering the entire structure with closely packed sods. The roof is made in the same manner, having an additional support of an inner circle of posts, with crochets to hold the cross-logs which act as beams to the dome-shaped roof. A circular opening in the centre serves as a chimney, and also to give light to the interior of the dwelling; a sort of sail is rigged and fastened outside of this opening to guide the smoke and prevent it from annoying the occupants of the lodge. The entrance passage-way, which usually faces eastward, is from 6 to 10 feet long, and is built in the same manner as the lodge.' An important type is the Wichita grass hut, circular dome-shaped with conical top. The frame is built somewhat in panels formed by ribs and cross-bars; these are covered with grass tied on shingle fashion. These grass lodges vary in diameter from 40 to 50 feet. The early Florida houses, according to Le Moyne's illustrations published by De Bry, were either circular with dome-like roof, or oblong with rounded roof, like those of Secotan in North Carolina, as shown in John White's figures. The frame was of poles covered with bark, or the latter was sometimes thatched. The Chippeway usually constructed a conical or hemispherical framework of poles, covered with bark. Formerly caves and rock-shelters {49} were used in some sections as abodes, and in the Pueblo region houses were formerly constructed in natural recesses or shelters in the cliffs, whence the designation cliff-dwellings. Similar habitations are still in use to some extent by the Tarahumare of Chihuahua, Mexico. Cavate houses with several rooms were also hewn in the sides of soft volcanic cliffs; so numerous are these in Verde Valley, Arizona, and the Jemez plateau, New Mexico, that for miles the cliff-face is honeycombed with them. As a rule the women were the builders of the houses where wood was the structural material, but the men assisted with the heavier work. In the southern states it was a common custom to erect mounds as foundations for council-houses, for the chief's dwelling, or for structures designed for other official uses. The erection of houses, especially those of a permanent character, was usually attended with great ceremony, particularly when the time for dedication came. The construction of the Navaho _hogan_, for example, was done in accordance with fixed rules, as was the cutting and sewing of the _tipi_ among the Plains tribes, while the new houses erected during the year were usually dedicated with ceremony and feasting. Although the better types of houses were symmetrical and