Two subsequent extensions mirror the development of its collections. The 1912 pavilion was largely funded by Jesse Haworth, a textile merchant, to house the archaeological and Egyptological collections acquired through excavations he had supported. The 1927 extension was built to house the ethnographic collections. The Gothic Revival street frontage which continues to the Whitworth Hall has been ingeniously integrated by three generations of the Waterhouse family. When the adjacent University Dental Hospital of Manchester moved to a new site, its old building was used for teaching and subsequently occupied by the museum.