The Night They Fell Under the Table: Chloroform and the Discovery of Modern Anaesthesia

Ether Came First — America, 1842–46

It is essential to state plainly, before any account of Simpson's discovery, that he did not invent surgical anaesthesia. That achievement belongs to a cluster of American practitioners working with ether, over a year before Simpson ever inhaled chloroform.

Crawford Long, a country physician in Jefferson, Georgia, administered ether to a patient before removing a neck tumour on 30 March 1842 — the earliest documented surgical use of ether anaesthesia. Long did not publish his results until 1849, however, and so his priority went largely unrecognised at the time, forfeiting him the public credit that timely publication would have secured.

Horace Wells, a Connecticut dentist, attempted a public demonstration of nitrous oxide anaesthesia at Massachusetts General Hospital in 1845; the patient groaned during the procedure, the audience jeered, and the demonstration was judged a humiliating failure, though Wells's underlying idea was sound.

It was Wells's former student and business partner, the Boston dentist William Thomas Green Morton, who made anaesthesia undeniable. On 16 October 1846 — a date still celebrated in American medicine as "Ether Day" — Morton administered sulphuric ether to a patient at Massachusetts General Hospital while the surgeon John Collins Warren removed a jaw tumour. The patient felt nothing. Warren turned to the assembled surgeons and said, "Gentlemen, this is no humbug." News of the demonstration crossed the Atlantic within weeks, and ether anaesthesia was in use at University College Hospital, London, by 19 December 1846 — nearly eleven months before Simpson's chloroform discovery, and even before Simpson had used any anaesthetic agent whatsoever.

Simpson's own first anaesthetic use came on 19 January 1847, when he administered ether to a woman in labour — the first such use in Britain, but a use of someone else's discovery, applied to a new context. Ether, however, dissatisfied him: it was slow to act, unpleasant to inhale, irritating to the airway, and highly flammable near the open flames of contemporary operating rooms and delivery rooms alike. Simpson began actively searching for something better — trying, by his own account, a series of volatile substances on himself and his assistants through the autumn of 1847, evening after evening, looking for an improvement on Boston's discovery.

Who Actually Made Chloroform

The chemical Simpson would eventually try was not new. Chloroform (trichloromethane) had been prepared independently by three chemists in three different countries in a single remarkable year, 1831, each apparently unaware of the others' work: Samuel Guthrie, an American physician-chemist working in Sackets Harbor, New York, who was investigating it as a possible insecticide and solvent; Eugène Soubeiran, a French pharmacist in Paris; and Justus von Liebig, the great German chemist at Giessen, who would go on to transform organic chemistry and agricultural science.

None of the three recognised any medical application. Chloroform remained, for over a decade, a laboratory reagent and industrial solvent — until the French chemist Jean-Baptiste Dumas established its correct molecular formula and gave it its enduring name in 1834. For thirteen years after Dumas's work, chloroform sat on pharmacists' shelves as an unremarkable chemical, its anaesthetic potential entirely unsuspected.

This is the plainest possible statement of the credit problem this article exists to resolve: Simpson discovered what chloroform could do to the human body. He had no part whatsoever in discovering what chloroform was. Any account that elides this distinction — and many popular ones do — misrepresents both the chemistry and the history.

Simpson: Physician and Showman

James Young Simpson was born on 7 June 1811 in Bathgate, West Lothian, the seventh son of a village baker. A prodigy, he entered the University of Edinburgh at fourteen, switched from arts to medicine two years later, and was licensed by the Royal College of Surgeons of Edinburgh at nineteen. In 1840, aged just twenty-eight, he was elected to the Chair of Midwifery at Edinburgh over older and more established rivals — a position that gave him both an obstetric practice among Edinburgh's professional classes and the platform of a university professorship.

Simpson combined genuine clinical talent with a flair for publicity and controversy that would prove decisive in the chloroform story. He was already an established innovator — he would go on to design obstetric forceps still used today, introduce iron-wire sutures and devise acupressure as a means of controlling surgical bleeding — and an established campaigner, willing to argue in print, in the pulpit's own language if necessary, for causes he believed in.

It was this combination — a working obstetrician with an experimentalist's restlessness and a controversialist's appetite for a fight — that made him receptive to trying an obscure industrial solvent on himself, and effective at forcing its adoption once he had.

The Night of 4 November 1847

The effect was immediate and unmistakable — utterly unlike the substances they had tried before. By Simpson's own later account and those of witnesses, "an unwonted hilarity seized the party" within moments of inhaling the vapour — then, abruptly, silence. All three men lost consciousness and slid from their chairs to the floor beneath the table.

When Simpson came to his senses, before he had even fully gathered himself, his recorded first words were: "This is far stronger and better than ether." He had, in a single evening of amateur self-experiment, found an anaesthetic markedly more potent, faster-acting and, crucially for a man who administered it to patients personally, more pleasant to inhale than the ether that had reached Britain the previous winter.

He wasted no time. Four days later, on 8 November 1847, Simpson administered chloroform to a patient in labour — the first deliberate obstetric use of chloroform anywhere in the world. Two days after that, on 10 November, he read a paper, "Account of a New Anaesthetic Agent," to the Edinburgh Medico-Chirurgical Society, formally announcing the discovery to the medical profession. The speed of this sequence — from private accident to clinical use to public announcement inside a single week — is itself a large part of why Simpson, rather than Guthrie, Soubeiran, Liebig or Dumas, is remembered as chloroform's discoverer in the sense that actually matters to medicine.

The Curse of Eve — Fact and Exaggeration

Popular retellings of the chloroform story often stage it as a battle between a lone rational physician and a monolithic, furious Church, brandishing Genesis against the relief of women's pain. The reality was messier, and less dramatic, than that framing suggests.

Some clergy did object to obstetric anaesthesia on theological grounds, citing Genesis 3:16 — "in sorrow thou shalt bring forth children" — as evidence that labour pain was divinely mandated and should not be artificially removed. Simpson answered them, memorably, with Genesis 2:21, in which God "caused a deep sleep to fall upon Adam" before removing his rib — arguing that the Almighty himself had administered the first recorded anaesthetic, making the very first surgical operation in scripture a painless one.

But this exchange, endlessly repeated in popular accounts, has hardened into a myth of near-universal clerical fury that the historical record does not fully support. Documented religious objection came from a vocal minority rather than a unified Church position, and it was neither the only nor even the primary source of medical caution about obstetric chloroform. Many physicians' concerns were practical: dosage was unstandardised, individual responses varied enormously, and the drug's margin of safety was, as would soon become tragically apparent, dangerously narrow. Later biographers and popularisers, keen to build Simpson into a singular hero of secular reason against superstition, have tended to amplify the religious controversy and understate the more mundane and, in hindsight, more justified medical anxiety about safety. Both existed. Neither was as one-sided as the legend suggests.

Queen Victoria and "That Blessed Chloroform"

Whatever the true balance of opposition, it took a single royal endorsement to end most of it. On 7 April 1853, the physician John Snow — later celebrated for tracing the Broad Street cholera outbreak — administered chloroform to Queen Victoria on a folded handkerchief, in small measured doses, for the birth of her eighth child, Prince Leopold. The Queen wrote afterwards of "that blessed Chloroform" as "soothing, quieting & delightful beyond measure."

The effect on public and professional opinion was immediate and disproportionate to any change in the scientific evidence. Whatever theological or medical reservations had circulated for six years dissolved, in practical terms, almost overnight. Chloroform in childbirth — "chloroform à la reine," as it was soon nicknamed — became fashionable as well as medically accepted, a reminder that social sanction, not just clinical proof, often determines how quickly a genuine discovery becomes ordinary practice.

The Safety Reckoning: Hannah Greener and the Cardiac Deaths

Chloroform's narrow margin between an effective dose and a fatal one became apparent almost immediately, and its early history includes a sobering warning that popular accounts of Simpson's triumph too often omit or minimise.

On 28 January 1848 — less than three months after Simpson's discovery — fifteen-year-old Hannah Greener of Winlaton, near Newcastle, died after being given chloroform for the removal of an ingrown toenail. Hers is generally recognised as the first recorded death directly attributable to anaesthesia of any kind. It would not be the last from chloroform specifically: the drug is capable of sensitising the heart muscle to adrenaline, producing sudden, fatal arrhythmias even at doses that were not, by the standards of the time, considered excessive.

Over the following decades, British medical authorities convened a series of investigations — the so-called Chloroform Committees, sitting periodically between the 1860s and the early twentieth century — to study the mounting toll of chloroform-related cardiac deaths and to try to establish safer protocols for its administration. Ether, by comparison, carried a wider safety margin, however unpleasant its other qualities. The eventual verdict of medical history was not kind to chloroform on safety grounds: through the first half of the twentieth century it was steadily displaced from routine use by agents that achieved the same anaesthetic goal with a much lower risk of sudden cardiac death.

None of this erases Simpson's discovery. It does mean that any honest account of chloroform anaesthesia must hold two facts together: it was a genuine and historic advance in the relief of human suffering, and it was also, for the better part of a century, a genuinely dangerous drug whose risks were incompletely understood at the moment of its introduction.

So What Did Simpson Discover?

Laid out plainly, the credit divides into at least four separate and non-competing claims, each belonging to different people in different countries and different decades:

• The chemical compound chloroform was independently synthesised in 1831 by Samuel Guthrie (USA), Eugène Soubeiran (France) and Justus von Liebig (Germany).
• Its correct formula and name were established by Jean-Baptiste Dumas (France) in 1834.
• Surgical anaesthesia as a concept, using ether, was demonstrated by American practitioners — privately by Crawford Long in 1842, unsuccessfully by Horace Wells in 1845, and decisively and publicly by William T. G. Morton on 16 October 1846.
• Chloroform's anaesthetic properties in humans, and its clinical introduction — especially into obstetrics — were discovered and championed by James Young Simpson, with his assistants James Matthews Duncan and George Keith, from 4 November 1847.

Simpson's true achievement sits squarely and only in the fourth category. It is not a small achievement — obstetric anaesthesia in particular was almost entirely his doing, and the more pleasant, faster-acting agent he identified accelerated the global adoption of anaesthesia generally. But it is a specific, bounded achievement, and treating Simpson as the singular father of anaesthesia — as some popular accounts still do — erases the American pioneers who came before him by more than a year, and the European chemists whose laboratory work made his discovery chemically possible in the first place.

Legacy: From Queen Street to the Operating Theatre

Chloroform itself has been retired from medicine for the better part of a century, replaced by agents that achieve the same end with far less cardiac risk. What survives, and what makes Simpson's discovery genuinely historic rather than merely a footnote to the American ether story, is the principle he helped establish beyond doubt: that pain in surgery and childbirth is not an inevitable, morally necessary feature of medical treatment but a problem that can be solved, safely and reliably, by chemistry.

That principle, proved on an American stage in 1846 and extended and popularised on an Edinburgh dining table a year later, underlies every general anaesthetic administered anywhere in the world today. Modern anaesthesiology owes its origin to both stories, not one — and understanding Simpson's real, specific, bounded contribution honours it more accurately, and more durably, than the inflated version of the legend ever could.

Myth vs Evidence

Timeline: 1831–1870