If a Dakota wishes to be particularly successful in any (to him) important undertaking, he first purifies himself by the Inipi or steam bath, and by fasting for a term of three days. During the whole of this time he avoids women and society, is secluded in his habits, and endeavors in every way to be pure enough to receive a revelation from the deity whom he invokes. When the period of fasting is passed he is ready for the sacrifice, which is made in various ways. Some, passing a knife through the breast and arms, attach thongs thereto, which are fastened at the other end to the top of a tall pole raised for that purpose; and thus they hang, suspended only by these thongs, for two, three, or even four days, gazing upon vacancy, their minds being intently fixed upon the object in which they desire to be assisted by the deity, and waiting for a vision from above. Once a day an assistant is sent to look upon the person thus sacrificing himself. If the deities have vouchsafed him a vision or revelation, he signifies the same by motions, and is released at once; if he be silent, his silence is understood, and he is left alone to his reverie. Others attach a buffalo hair rope to the head of a buffalo just as it is severed from the animal, and to the other end affix a hook, which is then passed through the large muscles in the small of the back, and thus fastened they drag the head all over the camp, their minds meanwhile being fixed intently, as in the first instance, upon the object in which they are beseeching the deity to assist them. A third class pass knives through the flesh in various parts of the body, and wait in silence, though with fixed mind, for a dream or revelation. A few, either not blessed with the powers of endurance or else lacking the courage of the class first named, will plant a pole upon the steep bank of a stream, and attaching ropes to the muscles of the arm and breast, as in the first instance, will stand, but not hang, gazing into space, without food or drink, for days. Still another class practice the haŋmdepi without such horrid self-sacrifice. For weeks, nay, for months, they will fix their minds intently upon any desired object, to the exclusion of all others, frequently crying about the camp, occasionally taking a little food, but fasting for the most part, and earnestly seeking a revelation from their god.[100] § 103. Similar testimony has been given respecting the Mandan, Hidatsa, and Arikara, though this last tribe belongs to the Caddoan stock. Smet wrote thus about them: They cut off their fingers and make deep incisions in the fleshy parts of the body before starting for war, in order to obtain the favors of their false gods. On my last visit to these Ricaries, Minataries, and Mandans I could not discern a single man at all advanced in years whose body had not been mutilated, or who possessed his full number of fingers.[101]