In a social system where responsibility for the care and support of children rests with the parents, society is justified in imposing restrictions designed to prevent the births of children to a socially incompetent person who is unable to assume such responsibility. Owing to the overcrowded conditions of state institutions for the care of the mentally defective, it is certain that patients committed to such institutions are scarcely able to provide satisfactory care and support for themselves, and would not be able to provide adequately for any children that they might produce. On this basis, society is quite justified in enacting the regulation, as, according to Popenoe (1, 2), has been done in one State, that no patient who has been committed to a state institution for the care of the feeble-minded shall be allowed to leave the institution without having first been sterilized.