Description: This monograph places the science and ideology of eugenics in early 20th century Portugal in the context of manifestations in other countries in the same period. The author argues that 3 factors limited the impact of eugenics in Portugal: a low level of institutionalization, opposition from Catholics and the conservative nature of the Salazar regime. In Portugal the eugenic science and movement were confined to three expressions: individualized studies on mental health, often from a 'biotypological' perspective; a particular stance on racial miscegenation in the context of the substantial Portuguese colonial empire; and a diffuse model of social hygiene, maternity care and puericulture.