This article presents some reflections on the book La bruja. A study of superstitions in the Middle Ages published by Jules Michelet in 1862, which puts the link between the body, brucelery, transgression and slaughter in the figure of the Middle Ages, Comadre or Bruge. To this end, various studies of this work and the bruja are used as the centre of their reflective interests. In this article, a poetic of sacrifice that sublises bad as an intensity of transgression. The blade is the woman who will be partially hidden with all her enthusiasts, holding a taster-cure from a botanical of transgression. Thus, the brush-victim who dies in the house shows the panic and horror that a hegemonic culture experiences in the face of the popular culture that is made body at slaughter in a inquisitorial process, as the bruja knows the magic powers of the knowledge that cures or can kill in the link between botanical and medicine.