were heard together in the High Court. The Government of South Australia also decided to intervene in the case. King was represented in the case by Lionel Murphy, a Labor Senator, and the leader of the opposition in the Australian Senate. Jones was represented by the Solicitor-General of Australia. Arguments King's main argument was based on section 41 of the Australian Constitution. That section provides that: 41. No adult person who has or acquires a right to vote at elections for the more numerous House of the Parliament of a State shall, while the right continues, be prevented by any law of the Commonwealth from voting at elections for either House of the Parliament of the Commonwealth. The argument was that, because King was an adult person who had a right to vote in elections for the South Australian House of Assembly (the more numerous house of the Parliament of South Australia), she therefore could not be prevented from enrolling or voting in federal elections by the Commonwealth Electoral Act 1918. "Adult person" However, the main argument for the respondent Jones was that King was not an "adult person" within the meaning of section 41, since adult meant a person who had reached the age of 21. It was argued that, when the Constitution of Australia came into being, the word "adult" would have been clearly understood as meaning a person over 21, and was used in contrast with the word "infant", which meant anyone under 21. But it was argued for King that the South Australian Age of Majority (Reduction) Act 1970 had altered the age at which people in South Australia are legally considered adults from 21 to 18. Lionel Murphy also suggested that "adult person" really meant a person considered to be mature, and that in 1972, a person over 18 years old was considered mature, at least in South Australia. Murphy also raised the examples that people over 18 can, by law, marry, be tried as adults under Australian criminal law, and can serve in the Australian Defence Force. Murphy cited a range of dictionaries, including legal dictionaries, which gave the definition of adult as a person who is considered mature. South Australia had intervened in the case, and the Solicitor-General for South Australia made the argument that section 41 of the Australian Constitution allows for differences between the states as to who has suffrage. He