Electrical light was introduced to museum building in 1882, but it was only in 1895 that it was deemed satisfactory enough to fully replace the gas lighting. During this time many of the staff members added to the collections, such as Valentine Ball, Richard J. Ussher, and Alfred Cort Haddon. Specimens were also purchased from suppliers such as Robert Damon, Edward Gerrard & Sons, Deyrolle, Václav Frič, Wilhelm Schlüter, Rowland Ward and Williams & Son, Dublin. From 1905 to 1911, Scharff and other members of staff took part in surveys with the RIA of islands off of Ireland such as Lambay and Clare Islands. The staff were also involved in cave explorations, the materials from which were deposited in the museum. From 1885 to 1920, the museum produced catalogues of its collections by taxa as well as more general guides to the collections across the various divisions. More specialised lists were also written by museum staff. Scharff oversaw further expansion of the collections, particularly for areas of fauna that had been previously poorly represented, with the aim that the collections would reflect the full diversity of fauna in Ireland in particular. In 1909 a new entrance was constructed at the east end of the building facing Merrion Street, partly due to the construction of the College of Science which now houses the Department of the Taoiseach. This reversed the direction from which visitors approached the exhibitions and explains why some of the large exhibits still face what appears today to be the back of the building.