Surgery before anesthesia was a nightmare performed in daylight. Operating rooms sat on the top floors of hospitals to capture as much natural light as possible, but the placement served a second purpose: it muffled the screams of patients from those on the floors below. Speed was the surgeon's only mercy. Ninety seconds was considered a respectable time to amputate a limb. Patients were held down, sometimes tied to operating chairs upholstered in red velvet -- a fabric chosen because it hid bloodstains. Alcohol or a sharp blow to the jaw were the best pain relief available. Into this world of controlled violence stepped Horace Wells, a Hartford dentist who in 1844 recognized the pain-killing properties of nitrous oxide. In January 1845, Wells traveled to this very room in Massachusetts General Hospital to demonstrate his discovery. The patient groaned. The audience shouted "Humbug!" Wells left in disgrace. His career spiraled: he abandoned his family, moved to New York, was arrested for throwing acid on people, and killed himself in jail.

Morton, once Wells' business partner, had been quietly refining the idea. Working with Harvard chemistry professor Charles T. Jackson, he shifted from nitrous oxide to diethyl ether, a more potent and reliable agent. On October 16, 1846, with the help of MGH surgeon Henry Jacob Bigelow, Morton was granted his chance. The patient, twenty-one-year-old Edward Gilbert Abbott, was an orphan and printer who had carried a vascular tumor on his neck since birth. Morton held the glass mouthpiece of his newly built etherizer to Abbott's lips and told him to breathe deeply and slowly. Within three to four minutes, Abbott fell into an unconscious, sleeplike state. Warren made the incision. Abbott did not flinch. During the surgery, Warren noted the patient's blood appeared unusually dark and speculated the ether might work by carbonizing the blood -- a remark that drew applause from the gallery. When Abbott awoke, he confirmed: no pain. Bigelow rushed to publish the results, and within weeks the news had crossed the Atlantic.

The discovery of anesthesia should have been a triumph. Instead, it became a tragedy worthy of Greek drama. Four men claimed credit: Morton the dentist, Jackson the chemist, Wells the nitrous oxide pioneer, and Crawford Long, a Georgia surgeon who had quietly used ether during an operation in 1842 but never published his findings. Morton and Jackson locked into a legal battle and pamphleteering war that consumed twenty years. In 1868, Morton read a newspaper article crediting Jackson. He became feverish, threw himself into a pond in Central Park, and died -- likely from a stroke -- shortly afterward. Jackson suffered a severe mental breakdown and died at McLean Asylum in Belmont, Massachusetts. Wells had already taken his own life in 1848. Only Crawford Long, who had never sought fame, died peacefully. The irony is that while these men destroyed each other fighting for recognition, the thing they fought over -- the conquest of surgical pain -- remains one of the most consequential gifts in the history of medicine.

The most unexpected witness to Ether Day arrived twenty-three years before the demonstration. In 1823, Massachusetts General Hospital received an Egyptian mummy, complete with painted wooden coffins, as a gift from a Dutch merchant named Jacob Van Lennep who was trying to impress his New England in-laws. The hospital's trustees accepted what they called "an appropriate ornament of the operating room" and put the mummy on display, charging visitors twenty-five cents -- making him the first complete Egyptian mummy exhibited in America. He then embarked on a year-long tour of the East Coast to raise funds for the fledgling hospital before being installed in the Ether Dome, where he silently witnessed more than 6,000 surgeries. Not until 1960 did anyone learn his name: Padihershef, meaning "He whom the god Hershef has given," a tomb prospector from Thebes who lived during Egypt's 26th Dynasty, around 663 to 525 BC. A full-body CT scan in 2013 revealed he was between twenty and thirty years old at death, suffered from arthritis, and had been so ill as a child that his growth temporarily stopped.

The Ether Dome has lived many lives since surgeons last operated under its glass ceiling in 1867. It served as a storage room, a dormitory, a dining hall for nurses, and finally, beginning in the 20th century, the teaching space and historic shrine it is today. A plaster cast of the Apollo Belvedere stands in the room, donated by statesman Edward Everett in 1845 -- a copy of the Vatican sculpture that Napoleon had looted and the Louvre had cast in plaster for sale. The snake coiled at Apollo's feet carries the ancient symbolism of healing, and Apollo himself was invoked in the original Hippocratic Oath. A teaching skeleton hangs nearby, visible in daguerreotypes from 1847 showing the administration of ether. The dome's architecture -- amphitheater seating arranged around a central stage, light flooding in from above -- established the template still followed by modern operating theaters, though today glass separates spectators from surgeons, and electric light has replaced the sun. The room sits on Boston's Cambridge Street, a quiet landmark amid the sprawling modern hospital, holding the memory of the afternoon when a dentist, a glass inhaler, and a young printer's willingness to breathe deeply ended thousands of years of surgical suffering.