Illiteracy, [32]
Ill-treatment of children, [196], [260-269]
Imbecility. See [Feeble-mindedness]
Immunity, acquired, [86]. See also [Regeneration]
Imprisonment, [225-228]
Incubators, [122]
Indeterminate sentence, [232], [233], [239-241]
Individual guardianship, [108-117]