title: Three letters by Sir James Young Simpson.
mesh_terms: D000773:Anesthesia, Obstetrical / Q000266:history*; D005019:Ethyl Ethers / Q000266:history; D006176:Gynecology / Q000266:history; D049672:History, 19th Century; D012606:Scotland
chemical_list: D005019:Ethyl Ethers