The Hunch That Started Everything

“Hofmann used the word 'presentiment', a feeling that there was something here, before any rational reason to think so. The most important discoveries arrive this way.”

In April 1943, Albert Hofmann returned to LSD-25, synthesized five years earlier, filed away when animal tests showed nothing interesting, because of what he called 'a peculiar presentiment.'

Not a hypothesis. Not a prediction derived from chemical theory. A presentiment: a pre-cognitive sense that something remained undiscovered.

The history of chemistry is full of such moments, though scientists are often reluctant to describe them this way. Kekulé's Ouroboros dream revealing benzene's ring structure. Fleming's accidental observation of the mold that killed bacteria.

Hofmann's presentiment returned him to LSD. He was synthesizing it again when he absorbed a small amount through his skin and experienced, briefly, 'an unusual sensation characterized by slight dizziness, restlessness, and remarkable imagery.' He recorded this in his laboratory notebook, the beginning of the most consequential pharmacological discovery of the twentieth century.

The hunch is often the most important part of the story, and the most difficult to transmit through formal scientific writing. Hofmann's memoir preserves it: not 'I hypothesized' but 'I had a presentiment.' The distinction is between rational inference and something harder to name, the capacity to be moved toward what matters before you know why it matters.

Sources

• Hofmann, LSD: My Problem Child (1979)