The Salem Witch Trials: Ergot, Hysteria and Historical Revisionism

In the winter of 1692, in the frozen farming community of Salem Village in the Massachusetts Bay Colony, two girls began to convulse. Betty Parris, aged nine, the daughter of the village minister Samuel Parris, and her eleven-year-old cousin Abigail Williams fell into fits that the local physician, unable to find a bodily cause, attributed to an “evil hand.” They contorted, screamed, complained of being pinched and pricked by unseen tormentors, and babbled in ways their elders found unearthly. Within weeks other girls were afflicted. By the time the panic burned itself out that autumn, around twenty people had been executed — nineteen hanged on Gallows Hill, one, the eighty-year-old Giles Corey, pressed to death under stones for refusing to enter a plea — and roughly two hundred had been accused.

For three centuries people have looked at those first convulsing girls and asked what was actually wrong with them. In 1976 a young psychology graduate offered an answer so clean and so scientific that it swept into textbooks almost overnight: the girls had been poisoned by a fungus in their bread. The ergot theory is one of the most popular explanations of Salem in circulation, and it is a genuinely good story with real evidence behind it. It is also, on the balance of the historical record, most likely wrong — and how it became so beloved says something about our hunger to reduce a moral catastrophe to a chemical accident.

What actually happened in Salem Village

The documented history of 1692 is unusually rich, because Puritan New England was a literate, record-keeping society and the trials generated depositions, warrants, examination transcripts and ministers’ letters that survive to this day. Salem Village was a poor, quarrelsome farming settlement on the edge of the more prosperous Salem Town, riven by land disputes and a bitter feud over the ministry of Samuel Parris. It sat in a colony under acute strain: the Massachusetts charter had been revoked and not yet replaced, a brutal frontier war with the Wabanaki and their French allies was sending refugees and trauma south, and the Puritan sense of a covenant with God under diabolical siege was at a fever pitch.

The accusations followed a revealing social geometry. The first three women named — Tituba, an enslaved woman in the Parris household; Sarah Good, a destitute beggar; and Sarah Osborne, an old woman of poor reputation — were exactly the marginal, defenceless figures a community reaches for first. But the panic did not stay at the margins. It climbed the social ladder to accuse respectable church members, a former minister, and eventually people close to the colony’s elite, which is part of why the authorities finally lost their nerve and shut it down. The court’s fatal procedural flaw was the admission of “spectral evidence” — testimony that the accused’s spirit or shape had afflicted the victims, something only the afflicted could see and no defendant could disprove.

The fungus in the bread

The ergot hypothesis was published in Science in 1976 by Linnda Caporael, then a graduate student, in a paper titled “Ergotism: The Satan Loosed in Salem?” Ergot is the fungus Claviceps purpurea, which infects cereal grains, especially rye, growing as dark spurs on the ripening ear. It contains alkaloids chemically related to lysergic acid — the family from which LSD is derived. Convulsive ergotism, one of two classic forms of poisoning, produces exactly the sort of symptoms that leap out of the Salem record: violent convulsions, crawling and pricking sensations on the skin, muscle spasms, vomiting, and vivid hallucinations.

Caporael’s argument was that the conditions in Salem Village were ripe for an ergot outbreak. Rye was a staple crop; the low, marshy fields west of the village would have offered the warm, wet growing conditions the fungus favours; and the afflicted grain, harvested in 1691, would have been eaten through the winter and spring of 1692, precisely when the fits began. It was an elegant piece of interdisciplinary detective work, and it landed at a cultural moment — the mid-1970s, well into the psychedelic era — when the idea that Puritan Salem had suffered a community-wide bad trip had an irresistible pull. The theory offered to dissolve a shameful chapter of religious persecution into a matter of contaminated agriculture.

Where the tidy explanation frays

The fork here is a case of an explanation that outran its evidence, with no cover-up involved, and the rebuttal came fast. The very next year, 1977, the psychologists Nicholas Spanos and Jack Gottlieb published a detailed reply, also in Science, and their objections have largely held up.

The symptom picture does not fit convulsive ergotism cleanly. That form of the poisoning is typically accompanied by severe, lasting gastrointestinal and neurological damage, and crucially it tends to require a dietary deficiency in vitamin A to take hold — a deficiency unlikely in a community with access to dairy and fish. The afflicted Salem girls, by contrast, mostly recovered fully once the trials ended, which is not how a genuine mass poisoning resolves. Ergotism also does not selectively strike adolescent girls in particular households while sparing everyone else eating from the same grain supply; the affliction in Salem followed social lines — clusters of accusers, patterns of who tormented whom — far more tightly than it followed the bread. The fits also frequently switched on and off in ways tied to the presence of the accused in the room, behaving like a social performance rather than a toxin’s steady course.

The grain supply itself argues against the theory. A batch of rye badly enough infected to poison the Parris household would have come from a shared harvest and a shared mill, and bread was the daily staple of everyone in the village, adults and children alike. Convulsive ergotism striking a settlement’s food supply produces sick people across households and age groups, not a tightly bounded circle of adolescent girls in and around the minister’s house while their parents, siblings and neighbours eating the same loaves stayed well. The affliction’s social precision — it followed relationships and rivalries far more faithfully than it followed the granary — is exactly what a toxin cannot produce and what a spreading pattern of behaviour, expectation and attention can.

There is also the plainest objection of all. Whatever was happening in the bodies of a handful of afflicted girls, it cannot by itself account for the trials. Nineteen hangings and a pressing were the work of magistrates, ministers, juries and neighbours who chose to credit spectral evidence, extract confessions, and pursue accusations up the social scale. A fungus cannot convene a court. Even granting the girls some organic malady, the machinery that turned their fits into a hundred death warrants was entirely human, and that machinery is what actually needs explaining.

Why the fungus keeps coming back

If the ergot theory has been substantially answered for nearly fifty years, why does it remain the explanation most people can name? Partly because it is genuinely clever and satisfyingly concrete — a named fungus, a chemical cousin of LSD, a plausible mechanism. It has the shape of a solved mystery, and solved mysteries travel well. But there is a deeper pull, and it is the interesting one.

Ergotism offers absolution. If a fungus caused Salem, then the tragedy was an accident of agriculture that could have happened to anyone, a misfortune rather than a moral failure. No one has to sit with the harder truth: that ordinary, pious, intelligent people, under strain and armed with a legal process that could not be challenged, deliberately hanged their neighbours on the word of children and the logic of fear. The chemical explanation lets us keep the comforting belief that people are fundamentally reasonable and that atrocity requires some external contaminant to switch it on. This is the same reflex that reaches for a demon to explain the Amityville murders — the wish that the horror came from outside the human beings involved.

The desire is understandable and deeply human, which is why the theory deserves respect even as the evidence goes against it. Nobody clings to ergot because they are foolish. They cling to it because the alternative — that a functioning community can talk itself into judicial murder without any poison at all — is genuinely frightening, and far harder to file away.

It is telling that the ergot idea arrived precisely when it did. Caporael published in 1976, a moment when a broad public had firsthand cultural knowledge of what powerful ergot-derived compounds could do to perception, and when reinterpreting the past through the lens of altered states had real appeal. A theory that made the Puritans into unwitting trippers fitted the temper of its own decade at least as neatly as it fitted the facts of 1692 — which is a useful reminder that explanations of the past are always partly artefacts of the present that produces them.

The panic we can actually document

Set the fungus aside and the historical record supplies a richer, more unsettling account, and it is one modern scholarship has reconstructed in detail. Historians such as Mary Beth Norton, in In the Devil’s Snare (2002), have tied the Salem outbreak closely to the trauma of the frontier war on the colony’s northern edge, arguing that the refugees and the pervasive dread of Wabanaki and French attack fed directly into the imagery and intensity of the panic. Others, including Paul Boyer and Stephen Nissenbaum in Salem Possessed (1974), mapped the accusations onto the village’s long factional and economic quarrels, showing how the geography of who accused whom tracked the fault lines of local resentment.

What emerges has nothing to do with poisoning: a system under load — a fragile settlement without a stable government, terrified by war, split by feud, steeped in a theology that took the Devil’s presence as literal fact, and equipped with a court willing to accept invisible evidence. Add a few genuinely distressed adolescents, whose fits may have owed something to anxiety, suggestion, group dynamics, or simply the enormous attention their behaviour suddenly commanded, and the fire had everything it needed to spread. The convulsions lit the match. The community built the pyre. That same pattern — a real, disturbing event at the centre, then a whole edifice of interpretation and punishment erected around it by frightened people — recurs whenever a society decides that its troubles must have a hidden, malevolent author, from early modern witch panics to the way rumour later hunted for enemies within during the Red Scare.

The ergot theory will keep circulating, because it is memorable and because it is kind — kind to our sense of ourselves as reasonable creatures. The trouble is that Salem’s real lesson lies in precisely the part the fungus explains away. Twenty people died in 1692 because a community afraid enough, and certain enough, found it terribly easy to believe the worst about its own; nothing in the bread killed them. That is a harder thing to keep in the cupboard, and a more useful one.