made public a $285 million master plan proposing to greatly expand its available exhibition space, by adding a 13-storey building on the block's east, adding a large central glazed atrium space. Administration The museum was administered directly by the colonial government until June 1836, until the establishment of a Committee of Superintendence of the Australian Museum and Botanical Garden. Sub-committees were established for each institution. Members of these committees were generally the leading members of the political and scientific classes of Sydney; and scions of the Macleay served until 1853, at which point the committee was abolished. In that year, the government enacted the Australian Museum Act, thereby incorporating it and establishing a board of trustees consisting of 24 members. William Sharp Macleay, the former committee chairman, continued to serve as the chairman of this committee. Curators and directors The position of "curator" was renamed "director and curator" in 1918 and from, 1921 "director". In 1948, the "scientific assistants" (the scientific staff) were redesignated "curators" and "assistant curators". In 1983, during a period of reorganisation, the position of curator was renamed as "collection manager". Collections and programs 20th century After a run of field collecting activities by the scientific staff in the 1880s and 1890s, field work ceased until after the First World War. In the 1920s, new expeditions were launched to New Guinea, the Kermadec Islands and Santa Cruz in the Solomon Islands, as well as to many parts of Australia, including the Capricorn Islands off the coast of Queensland. During the 19th century, galleries had mainly included large display cases overly filled with specimens and artefacts. During the 1920s museum displays grew to include dioramas showing habitat groups, but otherwise the Museum was largely unchanged during the period beginning with the curatorship of Robert Etheridge Jr (1895–1919), until the appointment of John Evans in 1954, when under his direction, additional buildings were built, several galleries were overhauled, and a new Exhibitions department was created. The size of the education staff was also radically increased. By the end of the 1950s, all of the galleries had been completely overhauled. The museum's growth in the field of scientific research continued with a new department of environmental studies, created in 1968. The museum support society, The Australian Museum Society (TAMS), now known as Museum Members) was formed in 1972, and in 1973 the Lizard Island Research Station (LIRS), was established near