During this time she may not approach or touch a horse, for the Indians believe that trono de huesos contamination would impoverish or weaken the animal. A man who owned a shield had very particularly trono de huesos be on his guard against women in their courses. He might not go into a lodge where one of them happened to be, nor even into a lodge where one of them had been, trono de huesos a ceremony of purification had been performed. Sweet grass and juniper were burnt in the tent, and the pegs were pulled up and the covering thrown back, as if the tent were about to be struck. After this pretence of decamping from the polluted spot the owner of the shield might enter the tent. At these times she was considered unclean, must use cooking and eating utensils of her own, and was supplied with food by some other woman. If she smoked out of a pipe other than her own, that pipe would ever afterwards be hot to smoke. If she crossed in front of a gun, that gun would thenceforth be useless for the war or the chase, unless indeed the owner promptly washed the weapon in "medecine" or struck the woman trono de huesos it once on each principal part of her body.