1874, rather cheaply. Thomas Salter, 1874–1888 Although the Brothers were unable to immediately sell the old mission house upon their removal, by 1874 Thomas Salter had acquired the house and farmland for A£2,000. He renamed the house "The Priory" and added his own L-shaped, picturesque gothic extension, now called 'the Salter Wing', added , behind Weaver's Palladian front on the north west. A map of 1885 shows the layout of Salter's land. It addition to the original kitchen, the Old Mission House and extensive stone terracing, the map shows the footprint of a shed, bush house, latrines, out house, tennis court, stables and coach houses. The position of the garden, poultry yard and cultivation paddock are clearly marked. Gladesville Hospital, 1888 When Thomas Salter moved from The Priory to Brynault in Mount Street in 1887 he sold the land to Gladesville Mental Hospital, the earliest psychiatric hospital on the Australian mainland. The Priory became the first hospital building to be utilised on the Riverglade Campus, the area of the hospital on the northern side of Victoria Road. For more than 60 years the surrounding land was farmed by patients for the production of fruit and vegetables for hospital use. Land reclaimed along the Tarban Creek shoreline extended the arable area. A Metropolitan Sewerage & Drainage Board map of 1928 shows, in addition to the kitchen, shed, latrines, out house and Old Mission House identified on the map of 1885, a new large stables building to the west at the rear of the house and the cow bails building alongside the kitchen. The Priory is labelled the dairy on this map. 1887–1947: the surrounding land was farmed by patients for the production of fruit and vegetables for hospital use. Land reclaimed along Tarban Creek shoreline extended the arable area. Twentieth Century changes A 1928 map shows a large stables building to the south at the rear of the house and the cow bails building alongside the kitchen. The Priory is labelled "The Dairy" on this map. The western verandah form varies from that on the 1885 survey plan and it appears a single storey pavilion of the Weaver extension may have been extended to the west. Little change occurred over the site in the early 20th century. Land below the Mission House was used as a golf course in the 1920s and 1930s, and the house istelsf used as the Ladies'