Mad as a hatter
"Mad as a hatter" is a colloquial phrase used in conversation to refer to a crazy person. In 18th and 19th century England mercury was used in the production of felt, which was used in the manufacturing of hats common of the time. People who worked in these hat factories were exposed daily to trace amounts of the metal, which accumulated within their bodies over time, causing some workers to develop dementia caused by mercury poisoning (called mad hatter syndrome). Thus, the phrase became popular as a way to refer to someone who was perceived as insane.
The origin of the saying may derive from:
- Mercury poisoning - Absorption of mercury through the skin can cause Korsakoff's syndrome.
- An incidence of nominalization of the verb hatter, which means "To harass; to weary; to wear out with fatigue." according to Samuel Johnson's A Dictionary of the English Language published in 1755. In the text he cites a passage from the work of John Dryden as an example of usage: "He's hatter'd out with pennance."
- Roger Crab, a 17th century eccentric who, after working for a short time as a hatter, gave all his goods to the poor and wore homemade sackcloth clothes.
- An adaptation of the Anglo-Saxon word atter meaning poison, closely related to the word adder for the poisonous Crossed Viper. Lexicographers William and Mary Morris in Morris Dictionary of Word and Phrase Origins (1977) favour this derivation because "mad as a hatter" was known before hat making was a recognized trade. According to A Dictionary of Common Fallacies (1980), "'mad' meant 'venomous' and 'hatter' is a corruption of 'adder', or viper, so that the phrase 'mad as an atter' originally meant 'as venomous as a viper'."
Early uses 
In a section of the January–June 1829 issue of Blackwood's Edinburgh Magazine, headed Noctes Ambrocianæ. No. XL1V, there is a conversation between a group of fictional characters:
NORTH: Many years - I was Sultan of Bello for a long period, until dethroned by an act of the grossest injustice; but I intend to expose the traitorous conspirators to the indignation of an outraged world.
TICKLER (aside to SHEPHERD.): He's raving.
SHEPHERD (to TICKLER.): Dementit.
ODOHERTY (to both.): Mad as a hatter. Hand me a segar.
Canadian author Thomas Chandler Haliburton used the phrase twice in his 1835 book The clockmaker; or the sayings and doings of Samuel Slick of Slickville: "And with that he turned right round, and sat down to his map and never said another word, lookin' as mad as a hatter the whole blessed time" and "Father he larfed out like any thing; I thought he would never stop - and sister Sall got right up and walked out of the room, as mad as a hatter. Says she, Sam, I do believe you are a born fool, I vow."
See also 
|Look up mad as a hatter in Wiktionary, the free dictionary.|
- Rees, Nigel (1987). Why Do We Say ...?. ISBN 0-7137-1944-3.
- Johnson, Samuel (2005). A Dictionary of the English Language: An Anthology. Penguin. p. 289. ISBN 0-14-144157-7.
- Barbara Mikkelson (13 July 2007). "Mad As a Hatter". snopes.com. Retrieved 6 September 2009.
- Gary Martin. "As mad as a hatter". phrases.org. Retrieved 6 September 2009.
- Original text by Project Gutenberg.
- Original text by Google Books