Senate composition at 1 July 1929 Coalition (28) - (10 seat majority)[i] Nationalist (24)[ii][iii] Country Party (4)
[2] The government changed during the Senate term as the Coalition of the Nationalist Party led by Prime Minister of Australia Stanley Bruce and the Country Party led by Earle Page lost the confidence of the House of Representatives and called an election for October 1929.
The Labor Party, led by James Scullin, won the election with a large majority.
[3] In 1931 five Labor members in the House of Representatives split from the Scullin government in opposition to its economic policies on the Great Depression and joined the Nationalist Party and three conservative independents in the House to form the United Australia Party (UAP).
Subsequently, some New South Wales members and senators were expelled from the Labor Party for their support of New South Wales Premier Jack Lang's policy of repudiating foreign debt and formed the Australian Labor Party (New South Wales)—known as Lang Labor—and later voted with the UAP to defeat the Scullin government, leading to the 1931 election.