"The tepees are pitched with all the regularity of an organized camp, in a large circle, inside which the stock is driven at night or on an alarm or occasion of danger. Outside the door is struck a spear or pole, on which is suspended the shield of the chief and a mysterious something tied up in a bundle, which is great medicine." (Dunraven, (1), pp. 94-95.) A white shield supported outside a tipi is visible in the photograph reproduced as plate 47. This remarkable picture has not, unfortunately, been identified, but it was undoubtedly made in the Upper Missouri Valley, and from the nature of the tipis, many appearing to be quite small, it may be assumed that it was a party of Indians who had come on a trading trip, rather than that it represented a regular village. Several accounts are preserved of large structures discovered in the region frequented by the Crows which, although not positively identified, were possibly erected by members of that tribe. Thus Lewis and Clark on July 24, 1806, arrived at an island in the Yellowstone River between 5 and 6 miles below the mouth of Clark's Fork, and wrote: "It is a beautiful spot with a rich soil, covered with wild rye, and a species of grass like the blue-grass, and some of another kind, which the Indians wear in plaits round the neck, on account of a strong scent resembling that of vanilla. There is also a thin growth of cottonwood scattered over the island. In the centre is a large Indian lodge which seems to have been built during the last summer. It is in the form of a cone, sixty feet in diameter at the base, composed of twenty poles, each forty-five feet long, and two and a half in circumference, and the whole structure covered with bushes. The interior was curiously ornamented. On the tops of the poles were feathers of eagles, and circular pieces of wood, with sticks across them in the form of a girdle: from the centre was suspended a stuffed buffaloe skin; on the side fronting the door was hung a cedar bush: on one side of the lodge a buffaloe's head; on the other several pieces of wood stuck in the ground. From its whole appearance, it was more like a lodge for holding councils, than an ordinary dwelling house." (Lewis and Clark, (1), II, p. 386.) This was undoubtedly a ceremonial lodge, and it was probably quite similar to another observed a few years later. To quote the description of the second example: "In the country of the Crow Indians, (Up-sa-ro-ka,) Mr. Dougherty saw a singular arrangement of the magi. The upper portion of a cotton-wood tree was implanted, with its base in the earth, and around it was a sweat house, the upper part of the top of the tree arising through the roof. A gray bison skin, extended with oziers on the inside so as to exhibit a natural appearance, was suspended above the house, and on the branches were attached several pairs of children's mockasins and leggings, and from one of the limbs of the tree, a very large fan