The History of Anesthesia: Ether, Chloroform, and the End of Surgical Agony

Before 1846, The Fastest Surgeon Was the Best Surgeon — Because Speed Was the Only Mercy

In the pre-anesthesia era, surgical speed was a life-saving skill. Renowned Scottish surgeon Robert Liston could amputate a leg in under two and a half minutes, a capability that reduced the time a patient spent in conscious agony and decreased mortality from shock. Patients were held down by assistants. Some fainted; those who didn't screamed throughout. Many were given alcohol or opium to dull the worst of the pain, but neither provided true analgesia during surgery, and large opium doses created their own dangerous complications. Surgery was limited to absolute necessity — amputations, tumor removals, bladder stone extractions — because the pain of elective procedures was simply unbearable and the patients would not permit them.

The transformation from this world to one in which patients could be placed in controlled unconsciousness and undergo surgery without awareness or pain occurred within a span of about two years, 1844–1846. The transition was not gradual but sudden, and it was followed immediately by one of the most acrimonious priority disputes in the history of science.

Nitrous Oxide and the Laughing Gas Parties

The story of anesthesia begins not in a hospital but at entertainment events. Joseph Priestley synthesized nitrous oxide in 1772. Humphry Davy at the Pneumatic Institution in Bristol systematically studied its effects beginning in 1798 and published his findings in 1800, noting that nitrous oxide produced euphoria, laughter, and insensibility to pain. He suggested it "may probably be used with advantage during surgical operations." Nobody followed up.

Instead, nitrous oxide became a popular entertainment. "Laughing gas parties" were fashionable in the 1830s and 1840s, where guests inhaled the gas for amusement. Itinerant showmen demonstrated its effects at public exhibitions. Ether followed a similar recreational trajectory: "ether frolics" were common at American colleges and medical schools, where students inhaled the solvent for its intoxicating effects. The gap between recreational use and medical application — when the soporific properties that made these substances entertaining were precisely what surgery needed — is one of history's more striking examples of a solution sitting in plain sight for decades before recognition.

Crawford Long's Undocumented Discovery

Crawford Williamson Long, a Georgia physician, administered ether to a patient for a tumor removal on March 30, 1842 — four years before the Boston demonstration that is conventionally credited as the discovery of surgical anesthesia. Long had attended ether frolics, noticed that participants didn't feel pain from their tumbles and bruises during the intoxication, and applied the observation clinically. He used ether for eight surgical cases between 1842 and 1846, never published his results, and did not publicly claim priority until after the 1846 Boston demonstration.

Long's failure to publish doomed his historical claim. Scientific priority belongs to the discoverer who communicates the discovery to the scientific community, not to the one who had the idea first. He spent subsequent decades in an ultimately unsuccessful dispute with William Morton over credit for the discovery, supported by many American physicians who felt the priority question had been handled unjustly.

The Boston Demonstration: October 16, 1846

William Thomas Green Morton was a Boston dentist who had been experimenting with ether under the guidance of chemist Charles Jackson. On September 30, 1846, Morton successfully extracted a tooth from patient Eben Frost under ether anesthesia. He then sought permission from Massachusetts General Hospital surgeon John Collins Warren to demonstrate the technique on a surgical case.

On October 16, 1846, in the hospital's surgical amphitheater — now known as the Ether Dome — Morton administered ether to patient Edward Abbott, who was having a vascular tumor removed from his jaw. Abbott felt no pain. Warren turned to the assembled medical students and witnesses and reportedly said: "Gentlemen, this is no humbug." The demonstration was reported in the Boston Medical and Surgical Journal within weeks, and the news spread globally at the speed of the telegraph and ocean mail.

Chloroform: The Dangerous Alternative

Scottish obstetrician James Young Simpson introduced chloroform as an anesthetic in November 1847, just 13 months after the Morton demonstration. Chloroform had a more pleasant induction experience than ether (which was irritating to the respiratory tract), a faster onset, and a smaller effective dose relative to its container volume, making it more portable. It was adopted rapidly, particularly in obstetrics: when Simpson administered it to Queen Victoria during the birth of Prince Leopold in 1853, it received the royal seal of approval that silenced the religious objections (primarily from Scottish Presbyterian clergy who argued that Genesis 3:16 — "in pain you shall bring forth children" — made painless childbirth contrary to divine will).

Chloroform was also significantly more dangerous than ether. Its therapeutic index — the ratio between the effective dose and the lethal dose — was much narrower, making fatal overdose easier to administer accidentally. The first documented death from chloroform anesthesia occurred in January 1848, one month after its introduction. Exactly how many patients died from chloroform is unknown, but the cardiac sensitization it causes (sudden cardiac death at even therapeutic doses, particularly with respiratory stimulation) resulted in deaths that were often attributed to other causes. Chloroform remained in use for decades despite its dangers, only being fully superseded by safer alternatives in the early 20th century.

The Bitter Priority Dispute: "The Most Disgraceful Chapter in the History of Science"

The dispute over credit for the discovery of anesthesia produced what Oliver Wendell Holmes Sr. — who had coined the word "anesthesia" in a letter to Morton — called "the most disgraceful chapter in the history of science." The claimants were Morton (who had performed the public demonstration), Jackson (who claimed he had given Morton the idea), Horace Wells (a dentist who had used nitrous oxide for dental extractions in 1844 and claimed he had shown the principle first), and Long (whose 1842 cases predated everyone). Congress debated awarding a $100,000 prize to the discoverer and never reached a conclusion. All four claimants died in poverty or tragedy: Wells committed suicide in 1848 while incarcerated for throwing acid on women while under chloroform intoxication; Morton died in 1868, financially ruined by his legal battles; Jackson died in an asylum in 1880; Long alone lived a relatively peaceful life in Georgia.

The medical community ultimately settled on the Boston demonstration of October 16, 1846 as "Ether Day," celebrated annually by Massachusetts General Hospital. The Ether Dome still stands in the hospital, and the surgical table used for Abbott's operation remains on display. Morton's gravestone in Cambridge, Massachusetts, reads: "Inventor and Revealer of Anesthetic Inhalation / Before Whom in All Time Surgery was Agony / By Whom Pain in Surgery was Averted and Annulled / Since Whom Science has Control of Pain." The inscription, however true its substance, papers over a story considerably more complicated than it acknowledges.