the boarding students were relocated once more to "Cheltenham", which was situated in what is now Jephson Street, Toowong. Constance Harker and Marjorie Jarrett purchased the school in 1909, and so began their partnership as co-Principals. The two women had met while teaching at the Presbyterian Ladies' College, Sydney, where Harker was senior English and classics mistress. Following their purchase of the school, they searched for a site in Brisbane that could house the day and boarding schools under one roof, and in 1912, settled on "Erneton" on Wickham Terrace, which was located next door to the boarders previous residence, "Garth House". A paddock at the rear of Garth House was rented for a netball court. As time went on, space became limited at the new site, and so Athol Place, a few doors away on the Terrace was rented for extra boarders and two primary classes. Harker and Jarrett gained little income from the school, as teacher-proprietors had little chance of financing a modern expanding school, especially one with boarding facilities. In 1918, due to these financial struggles, they transferred ownership to the newly formed Presbyterian and Methodist Schools Association, while retaining their Principalship. In 1920 the school moved from Wickham Terrace to its present site on Mater Hill, in South Brisbane, opening with an enrolment of 225 pupils. The boarding-school occupied "Cumbooquepa",the now heritage-listed former home of prominent Brisbane businessman, newspaper publisher, and one time Mayor of Brisbane, Thomas Blacket Stephens and his son William Stephens mayor of the South Brisbane City Council (built 1890). A new classroom block was constructed in 1919, designed by architect Lange Powell. At this time the school's name was changed to Somerville House, in recognition of the work of Mary Somerville (1780–1872), a famous Scottish scientist and mathematician of the 19th century. Over the next two decades the school carried out a major building programme and established a good reputation. Harker retired in 1931, but continued to live at the boarding school until Jarrett's retirement in 1940. During her time as Principal, she gained a reputation in Queensland as a pioneer in the education of girls. The academic achievements of Somerville House during her co-Principalship were amongst the best in the state, and she widened the interests of her pupils by encouraging visitors who were authorities on literature, music, art and international affairs. She encouraged good citizenship and social service, and during