Antonio Vallejo Nagera (1889-1960) y la eugenesia en la Espa？a Franquista.: Cuando la ciencia fue el argumento para la apropiación de la descendencia

in the early decades of twentieth century in spain, a group of intellectuals and men belonging to science and linked to fascism, including the doctor antonio vallejo nagera, adhered and extended the concept of eugenics with different motives, one of wich was to improve the race, another to legitimize and be guarantor of the new order. for this, they served of different schools that were developed theoretically from this concept, one of them was generated by the ideas of jean baptiste lamark (1744-1829), who developed the hypothesis that the environment produces changes in organisms or races, held at the time are transmitted hereditarily. the purpose of this work is to evaluate what were the origins, characteristics and doctrinal framework of eugenics in spain during the franco period and how was used as an argument for appropriation of descent.