Arranging the skin covers of several large tipis in such a way as to form a single shelter, to serve as a ceremonial "lodge," was the custom of many tribes, and other instances will be mentioned. But another and more elaborate form of structure was used by the tribes just mentioned. In 1858, when describing certain customs of the people then living along the course of the Minnesota and in the vicinity of Lake Traverse, Riggs referred to the sacred dance and said: "Among the Dakotas a most remarkable society exists which is called _Wakan wachepe_, or Sacred Dance, of which the medicine sack is the badge. It may be regarded as the depository and guardian of whatever they esteem as _wakan_, or sacred." He then related the contents of the bag and the meaning of the ceremony, and continues: "A large skin lodge is usually occupied as the center of operations, the door of which is made wide by throwing up the corners. From this, on each hand, extends a kind of railing, some thirty or forty feet, on which skins are thrown. The entrance is at the farther end. All around the inside of this sanctum sanctorum and along the extended sides sit those who are called to the dance. Beyond this and near the place of entrance is a fire, with great kettles hanging over it, which are filled with dried buffalo meat or other food; and near by lay several packs or bags of the same, which are consecrated to the feast. The whole village are gathered around and are looking over or peeping through the holes in the barricades." Much was then told about the strange and curious ceremonies enacted within the lodge. (Riggs, (1), pp. 505-506.) Leaving the encampment in the vicinity of the post of the Columbia Fur Company, the Long expedition moved northward, and when just beyond Lake Traverse, while traversing the prairies on July 27, 1823, "passed a party of squaws engaged in conveying to their camp some slices of fresh meat to jerk; their fellow labourers were dogs. Each of the dogs had the ends of two poles crossed and fastened over the shoulders, with a piece of hide underneath to prevent chafing. The other extremities dragged on the ground. This sort of vehicle was secured to the animal by a string passing round the breast, and another under the abdomen; transverse sticks, the ends of which were fastened in the poles, kept these at a proper distance, and supported the meat. This seems to be the only mode of harnessing dogs, practised among the Sioux; we believe, they never use them in teams, as is customary with the traders." (Keating, (1), II, pp. 9-10.)