We traveled eastward for two days, and then the gloomy ridges of the Black Hills rose up before us. The village passed along for some miles beneath their declivities, trailing out to a great length over the arid prairie, or winding at times among small detached hills or distorted shapes. Turning sharply to the left, we entered a wide defile of the mountains, down the bottom of which a brook came winding, lined with tall grass and dense copses, amid which were hidden many beaver dams and lodges. We passed along between two lines of high precipices and rocks, pile............