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Anaesthetics are gases (or other substances) which make people unconscious.OF nitrous oxide, Sir Humphry Davy wrote, "It appears able to destroy physical pain. It may be used with advantage during surgical operations in which no great amounts of blood are lost."They are used in operations, and this passage describes some early tests on nitrous oxide (laughing gas) and ether.The passage comes from Sir James Y. Simpson (1896).This man was a famous surgeon and was the author's father."The first experiment," said Sir James Simpson, "of breathing enough vapour to destroy all feeling was made neither in America nor in our own days.

Anaesthetics are gases (or other substances) which make people unconscious. They are used in operations, and this passage describes some early tests on nitrous oxide (laughing gas) and ether. The passage comes from Sir James Y. Simpson (1896). This man was a famous surgeon and was the author's father. He was born in 1811 and died in 1.870.

OF nitrous oxide, Sir Humphry Davy wrote, "It appears able to destroy physical pain. It may be used with advantage during surgical operations in which no great amounts of blood are lost."

"The first experiment," said Sir James Simpson, "of breathing enough vapour to destroy all feeling was made neither in America nor in our own days. Let me remind you that Sir Humphry Davy boldly made the experiment many times upon himself, although he had seen occasional deaths in animals from it. He did this in the last century, with nitrous oxide, and, further, found that headache and other pains disappeared under its influence."

The uses of this gas lay partly forgotten for nearly forty years, till a Mr. Colton, lecturing on laughing-gas in Hartford, Connecticut, had among his audience Mr. Horace Wells, dentist. Mr. Wells was surprised by seeing a person who breathed it fall and knock himself badly, without being conscious of the fact.