 The idea expressed by A. O. Neville, the Chief Protector of Aborigines for Western Australia, and others as late as 1930 was that mixed-race children could be trained to work in white society, and over generations would marry white and be assimilated into the society.Some European Australians considered any proliferation of mixed-descent children (labelled "half-castes", "crossbreeds", "quadroons", and "octoroons", terms now considered derogatory to Indigenous Australians) to be a threat to the stability of the prevailing culture, or to a perceived racial or cultural "heritage".The Northern Territory Chief Protector of Aborigines, Dr. Cecil Cook, argued that "everything necessary [must be done] to convert the half-caste into a white citizen".