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Gaseous Anesthetics.

Introduction The history of anesthesia is a relatively recent one; if one begins with the analgesia dentist, Horace Wells, who discovered the used nitrous oxide during a dental extraction in the early 1800s. The first public showing of anesthesia occurred in October 1846, when ether was used to prevent pain during surgery at Massachusetts General Hospital. The following year, in 1847, Scottish obstetrician James Y. Simpson began using chloroform to treat childbirth pain. In 1956, halothan