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In Finnish, henki designates at the same time “soul,” “breath,” and “life” and is understood as the vital force necessary for movement of the body.17 This entity disappears at our death, and when a person is close to death, the door or window is opened so that it can leave. For the same reason, in France there was the custom in many places of raising a shingle from the roof in the house where someone died. When an evil person died, the henki would leave in the form of a tempestuous wind.a The henki can leave a person’s body at times other than death. In such instances it exits from the mouth in the form of a small animal—a mouse, a butterfly, or a fly, as the forest-dwelling Finnish of Varmland believed. The henki possesses many traits of the Norse hugr, but the hugr is also related to another soul called vaimas in Finland. In the north of this country the inhabitants use this term for a quiver, such as an involuntary tremble or an eyelid that flutters suddenly, phenomena that the Carelians name elohiiri, “vital mouse,” or ihohiiri, “mouse of the skin,” the mouse being the spirit that can move throughout the whole body.
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Claude Lecouteux (Witches, Werewolves, and Fairies: Shapeshifters and Astral Doubles in the Middle Ages)