Although the phrase "mad as a hatter" is, and will likely long be, associated with
Charles Dodgson's (a.k.a. Lewis Carroll's) 1865 novel, Alice in Wonderland, contrary
to popular belief, Carroll neither coined the phrase nor did he use it in his works.
(The Hatter is referred to as "mad", along with his little tea party, but he is never
explicitly called "Mad Hatter" in Carroll's works nor is the phrase "mad as a hatter"
used.)
So where did the phrase "mad as a hatter" actually come from?
The first documented instance of the phrase can be found in the 1829 short story, Noctes
Ambrocianæ, published in Blackwood's Edinburgh Magazine:
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.
The next known documented instance of it appears in the 1835 work The Clockmaker, by Canadian
Thomas Chandler Haliburton:
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 later in the same work) 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.
The leading theory as to the origin of the phrase is that it refers to a genuine condition
that began afflicting certain hat makers in the 17th century called "mad hatters'
syndrome" or "hatters' shakes".
The symptoms associated with this condition were first described in full detail in 1829
by a Russian physician, the same year the first known instance of the expression came
about.
It continued to be a problem for hat makers through the 19th century in much of the Western
world, though in the U.S. it was a phenomenon that continued into the mid-20th century for
reasons we'll get into in a bit.
As to the underlying cause of mad hatters' syndrome, in the 17th century in France, expensive
hats made of felt began being produced using mercury nitrate.
The method in question seems to have been developed by the Huguenots of France who,
after Louis XIV revoked the Edict of Nantes in 1685, which had previously given them certain
religious freedoms and rights, were forced to flee to Britain where they soon shared
their little trade secret with British hatters, with it spreading from there.
The specific felt production method here was to use mercury nitrate in a solution used
to strip fur from animal skin (usually from a rabbit or beaver) in a process known as
"carroting", so called because of the orange-ish colour of the mercury-nitrate solution.
(Aside: before the 17th century, carrots were predominantly purple, not orange.)
The specific benefit to the mercury nitrate here was to cause the stiffer outer hairs
to soften and become limp, allowing the hatters to pack them together more easily.
After carrotting, the resulting matted fur was shrunk in boiling water and then dried.
The processed felt subsequently used for hat making continued to emit mercury vapour for
some time after carrotting.
Hat makers rarely wore any kind of safety equipment or protective clothing back then
and often worked in cramped, extremely poorly ventilated work spaces.
Because of this, invariably they were exposed to dangerous amounts of mercury vapours during
their day to day lives, culminating in prevalent mercury poisoning among those in the industry.
The symptoms of mercury poisoning are numerous and in many cases extremely severe, affecting
the heart, brain, lungs, kidneys and in some cases, the immune system, among other things.
Most pertinent to the topic at hand, neurological symptoms associated with mercury poisoning
can include, but are not limited to, abnormal sensations in the limbs, muscle tremors, erratic
mood changes and mental deterioration.
The behaviour of those afflicted by mercury poisoning is usually typified by anxiety,
extreme timidness and a general desire to remain "unobserved", usually responding
with anger or irritability if this wish is ignored.
Back in the halcyon days of the 18th and 19th century when these symptoms were seen simply
as a necessary aspect of making nice hats, instead of a debilitating, avoidable health
concern, people simply referred to the condition as the "hatters' shakes" with little
effort initially being expended to discover the underlying cause.
Over in America, hat makers didn't fare any better, with those suffering from what
medical literature would later more accurately define as "mercurial tremors" experiencing
a similar amount of apathy towards fixing or preventing the problem being demonstrated.
The condition was also known to some in the 1850s as the "Danbury Shakes", Danbury
being the largest hat-making town in America at the time.
In 1860, a treatise on common ailments that seemed to affect a large percentage of New
Jersey hatters was written by physician Addison Freeman, titled Mercurial Disease Among Hatters,
published in the Transactions of Medical Society of New Jersey.
Freeman noted in the paper (which was completely ignored by the local industry),
A proper regard for the health of this class of citizens demands that mercury should not
be used so extensively in the manufacture of hats, and that if its use is essential,
that the hat finishers' room should be large, with a high ceiling, and well ventilated.
One year later, Adolph Kussmaul wrote at length about the symptoms of mercury poisoning in
1861, including briefly mentioning hatters in the work.
As a result of mercury now correctly being identified as the culprit behind mad hatters'
syndrome, alternate methods of processing the fur were developed over the following
decades.
This resulted in mercury being phased out of the production of felt hats in places like
France and Britain by the end of the 19th century (even by law in France), but not in
the United States.
As one report in the Bureau of Statistic of Labor and Industries of New Jersey noted in
1890 concerning the conditions at hatter workshops:
The surprise is that men can be induced to work at all in such death producing enclosures.
It is hard to believe that men of ordinary intelligence could be so indifferent to the
ordinary laws of health…
It does not seem to have occurred to them that all the efforts to keep up wages… [are]
largely offset by the impairment of their health, due to neglect of proper hygienic
regulations of their workshops…
And when the fact of the workmen in the sizing room, who stand in water, was mentioned, and
the simple and inexpensive means by which it could be largely avoided was spoken of,
the reply was that it would cost money and hat manufacturers did not care to expend money
for such purposes, if they could avoid it.
Another report, Chronic Mercury Poisoning, noted of hatters in the 1940s,
The man affected is easily upset and embarrassed, loses all joy in life and lives in constant
fear of being dismissed from his job.
He has a sense of timidity and may lose self control before visitors.
Thus, if one stops to watch such a man in a factory, he will sometimes throw down his
tools and turn in anger on the intruder, saying he cannot work if watched.
Occasionally a man is obliged to give up work because he can no longer take orders without
losing his temper or, if he is a foreman, because he has no patience with men under
him.
Drowsiness, depression, loss of memory and insomnia may occur, but hallucinations, delusions
and mania are rare.
The most characteristic symptom, though it is seldom the first to appear, is mercurial
tremor.
It is neither as fine nor as regular as that of hyperthyroidism.
It may be interrupted every few minutes by coarse jerky movements.
It usually begins in the fingers, but the eyelids, lips and tongue are affected early.
As it progresses it passes to the arms and legs, so that it becomes very difficult for
a man to walk about the workshop, and he may have to be guided to his bench.
At this stage the condition is so obvious that it is known to the layman as "hatter's
shakes."
Rampant mercury poisoning among hatters and felt makers didn't end in the United States
until WW2.
In 1941, the U.S. Public Health Service convened a meeting with representatives from the felt
and hat making industries to force them to use an alternative method of felt production.
While it may seem like they were doing this only out of concern for the workers, in fact
they had long known about this particular problem within this industry.
The real impetus for finally doing something about it was to conserve mercury for use in
the war, with a side benefit being better working conditions for felt producers.
With the push, the industry representatives agreed to switch to using a different, well-known
method of felt production using prevalent and cheap hydrogen peroxide.
In any event, Lewis Carroll would have been well aware of the symptoms of mad hatters'
syndrome, as he grew up in Stockport, one of the major hat making hubs of England at
the time.
Nevertheless, seemingly intentionally, Carroll's Hatter, while a bit of an oddball, does not
portray the typical symptoms associated with mercury poisoning, such as extreme shyness,
shakes, loss of self-confidence, and timidness to an excessive degree.
This type of behavior couldn't contrast more with the exuberant and jovial personality
of the character, a fact that probably wasn't lost on Carroll's original audience.
Later, Carroll further injects a little subtle reference to the syndrome when the King of
Hearts tells the Hatter not to be nervous, a seemingly uncontrollable trait of "mad
hatters" of the day, lest he execute him on the spot.
It has also been speculated (with no hard evidence to back this notion up, so take this
with a very large grain of salt) that Carroll based the character on Theophilus Carter,
a noteworthy furniture dealer who lived at 48 High Street, Oxford while Carroll was an
Oxford don.
Carter was considered something of an eccentric who, according to the British Medical Journal,
is known to have been called "the mad hatter", presumably referencing his oddball behavior
and the fact that he purportedly almost always went around wearing a large top hat.
Pertinent to the topic at hand, Theophilus once invented a particularly useful alarm
clock (presented at the Great Exhibition in Hyde Park in 1851) that, at the appropriate
time, would tip the bed over, unceremoniously dumping the sleeping occupant on the floor.
It has been speculated, again with zero documented evidence backing the idea up, that this particular
invention inspired Carroll a little over a decade later to make the Hatter obsessed with
time in Alice and Wonderland.
If mercury poisoning wasn't enough, New Jersey hatters in the late 19th century had
another major ailment to contend with due to the extremely poor working conditions they
were made to endure- tuberculosis.
In fact, nearly 2/3 of hatters in New Jersey were dead of a pulmonary disease by 30 years
old.
The rates of mercury poisoning among this same group was reported as high as 50%, with
this number thought to be low given that many workers would attempt to mask their symptoms
for fear of losing their jobs.
In the 1930s, the U.S. Public Health Service reported the condition appearing in a whopping
80% of all felt makers.
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