A sketch of Fort Pierre as it appeared July 4, 1851, is given in plate 23, _b_. This was the work of the young Swiss artist, Friedrich Kurz, and is now reproduced for the first time. The small groups of Indians, the tipis standing near the fort, and the rolling prairie in the distance are all graphically shown. The several divisions of the Teton performed the sun dance, at which time a large ceremonial lodge would be erected, which stood alone in the camp circle, formed of the numerous skin tipis. The lodge as reared at different times and by the various tribes varied in form and method of construction, but it seems to have been the custom of all the tribes to abandon the structure at the termination of the ceremonies. It was regarded as a sacred place and one not to be destroyed by man. Large structures of this sort were often encountered by parties traversing the plains and adjacent regions, and one, probably erected by a tribe of the Teton, was discovered by the Raynolds party, July 16, 1859, in the extreme eastern part of the present Crook County, Wyoming. In the journal of the expedition it was written on that day, "We have not yet met any Indians, nor any indications of their recent presence. The site of our camp is, however, marked by the remains of an immense Indian lodge, the frame of which consists of large poles, over thirty feet in length. Close by is also a high post, around which a perfect circle of buffalo skulls has been arranged." (Raynolds, (1), p. 31.) This may have been used during the preceding year, at which time the skin tipis of the people enacting the sacred ceremonies were pitched in the form of a circle with the great lodge standing in the center. But with the completion of the annual dance the participants removed, with their skin tipis, to other localities, allowing the sacred structure to be destroyed by the elements. OGLALA. Of the early history of this, the principal division of the Teton, nothing is known. During the first years of the last century they were discovered by Lewis and Clark on the banks of the upper Missouri, south of the Cheyenne River, in the present Stanley County, South Dakota. They hunted and roamed over a wide region, and by the middle of the century occupied the country between the Forks of the Platte and beyond to the Black Hills. While living on the banks of the Missouri their villages undoubtedly resembled the skin-covered tipi settlements of the other kindred tribes, and later, when they had pushed farther into the prairie country, there was probably no change in the appearance of their structures. A very interesting account of the villages of this tribe, with reference to their ways of life, after they had arrived on the banks of the Platte, is to be found in the narrative of Stansbury's expedition, during the years 1849 and 1850.