of Science and Art The institution became the Edinburgh Museum of Science and Art in 1864, with two divisions; Natural History, and Industrial Arts. The natural history collection was transferred from the university in 1865–1866. Prince Alfred formally opened the first phase on 19 May 1866, with public access to the east wing and about a third of the Great Hall (now the Grand Gallery). A temporary wall formed the west gable of this space, displays in it included models and machinery of architecture, military and civil engineering, including lighthouses. A small hall (now Living Lands) accommodated manufactures. The natural history collection took up the large hall in the east wing (now Animal World), a corridor link to the university formed a "Bridge of Sighs" over West College Street. On the western half of the site, "old buildings" which had formed Argyll Square were in temporary use for agricultural and educational exhibits. George Allman became Regius Professor and Keeper of the natural history collection in 1855. Issues developed over access to specimens for teaching, particularly when some were lost, and he apparently neglected curation. Wyville Thomson took over in 1870, and the Board of Trade redefined duties, but curation was not his priority. For a reception in the Spring of 1871, the museum stored refreshments in the "Bridge of Sighs" corridor, but students found this and no drinks were left for the Edinburgh worthies, so a door restricted access from the university. Wyville Thomson went on the Challenger expedition for four years. The museum severed ties with the university in 1873, and appointed Ramsay Traquair as its Keeper of the Natural History Collections. The bridge was closed (at some time later it was reopened and for a while prior to the museum's temporary closure during World War II it provided limited access between the museum and University). The university had lost use of the museum specimens, so started a replacement teaching collection in its old museum space. This became intolerably cramped, eventually James Hartley Ashworth raised funds and a new teaching laboratory and museum was opened in 1929 at the King's Buildings campus. In 1871 work began on widening the street to the north of the university and museum to form Chambers Street, linked to George IV Bridge. The central section of the Museum of Science and Art building, including the rest of the Great Hall, was completed in 1874