- Large bronze plaque
- ED.CS.2022.8
- Bronze Plaque which reads: "In 1847 in a pharmacy on this site Duncan Flockhart & Co made the chloroform used by Sir James Young Simpson in his historical experiements on the relief of pain. This plaque was erected on the occasion of the Third World Congress of the International Association for the Study of Pain held in Edinburgh 1981."
- Twentieth century