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mad as a hatter : ウィキペディア英語版
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 patronised 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.
== Etymology ==
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'."
19th-century hatters in Danbury, Connecticut, developed a condition known colloquially as the Danbury Shakes. The condition was characterized by slurred speech, tremors, stumbling, and, in extreme cases, hallucinations. 〔''Mercury Workshop'', p. 23, Ohio Indoor Air Quality Coalition, 2008.
"In the late 1800’s hat makers, or hatters, used to use mercury nitrate when working with beaver fur to make felt. Over time, the hatters started exhibiting apparent changes in personality and also experienced tremors or shaking. Mercury poisoning attacks the nervous system, causing drooling, hair loss, uncontrollable muscle twitching, a lurching gait, and difficulties in talking and thinking clearly. Stumbling about in a confused state with slurred speech and trembling hands, affected hatters were sometimes mistaken for drunks. The ailment became known as 'The Danbury Shakes' in the community of Danbury where hat making was a major industry. In very severe cases, they experienced hallucinations. The term “mad as a hatter” may be a product of mercury toxicity. The practice did not completely stop until 1943."


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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