title: The metapsychology of opium.
mesh_terms: D006212:Hallucinations / Q000139:chemically induced; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008093:Literature, Modern; D009892:Opium / Q000266:history
chemical_list: D009892:Opium