title: Why was there a four-decade delay before anesthesia was introduced in 1846?.
authors.forename: David A E
authors.initials: DA
authors.lastname: Shephard
mesh_terms: D000769:Anesthesia, Inhalation / Q000266:history*; D018685:Anesthetics, Inhalation / Q000266:history; D049672:History, 19th Century; D006801:Humans; D009609:Nitrous Oxide / Q000266:history
chemical_list: D018685:Anesthetics, Inhalation; D009609:Nitrous Oxide