¿Dobles o espíritus? Las teorías del desdoblamiento frente al espiritismo en la España de principios del siglo XX

This paper discusses the relation between dissociation theories and spiritism in Spain. It shows two cases that took place at the beginnings of the 20th Century. The first describes the mental dissociation that the physician Victor Melcior attributed to the medium Teresa Esquius. The second shows the polemic, between the astronomer Josep Comas and the spiritist Jacint Fornaguera, in regard to the bodily dissociation in the medium Carmen Dominguez. It is argued that these kind of debates favoured the scientific study of mediumship.