Anaesthetics are gnus (or other substasom) which make peopl unconscious.He was born in 1811 and dind in 1870

OF nitrous oxide, Sir Huzpiry Davy wrote, appar able t mooy physical pain. They are uaod in operations, and this passage mibe mrly tuts on niran oxide Sanghing git) sad aber.This man was a fhnom son und was the author's fatter.The passage conses fun Sir James Y. Simpsan (1896).