One of the earliest iterations of the RDS museum was in Hawkins Street House, where the Leskean Cabinet was displayed along with a collection of casts and busts. This exhibition was open to the public between noon and 3pm, on Monday, Wednesday and Friday. Aside from the exhibition there was a lecture hall, laboratory and library. From here, the museum moved to Leinster House in 1815 when the RDS purchased it from His Grace The 3rd Duke of Leinster. Here the Leskean Cabinet continued to be displayed, along with newly accessioned collections from the professor of mineralogy and geology, Charles Lewis Giescke, curiosities, and the Hibernicum which was a display of minerals and geological specimens from the island of Ireland.