Antoine Delpit

Delboeuf is presented as both the dreamer of a striking memory puzzle and an investigator able, years later, to recover its forgotten sources. His dream of lizards and an unfamiliar fern-name seemed to contain knowledge unavailable to him while awake; two later discoveries linked its details to experiences he had once forgotten. The episode gives concrete form to Freud’s argument that dream-memory can preserve material beyond the reach of waking recollection, and that an apparent mystery may yield to patient reconstruction.

The dream of the lizards

In the dream, the yard of Delboeuf’s house is covered with snow. He finds two little lizards half-frozen and buried beneath it, warms them, and returns them to a small hole in the wall. He feeds them leaves from a fern growing there, which he knows in the dream as Asplenium ruta muralis. The dream resumes after an interval: two more lizards appear, then a fifth and a sixth approach the hole, until a procession of lizards is moving along the road.

The dream’s precise plant-name is the first puzzle. Delboeuf knew the Latin names of only a few plants in waking life, and Asplenium was not among them. The actual fern was called Asplenium ruta muraria, a name the dream had slightly altered. The small difference did not explain how the name entered the dream; for Delboeuf, its apparently accurate but inaccessible knowledge remained mysterious.

Recovering the forgotten sources

The dream occurred in 1862. Sixteen years later, while visiting a friend, Delboeuf noticed an album of dried flowers, the kind sold as souvenirs in parts of Switzerland. He opened it, found the Asplenium from the dream, and recognized his own handwriting beside the Latin name. The album connected the dream to an earlier, otherwise forgotten encounter: in 1860, the sister of the friend he was visiting had brought the album to Delboeuf during her honeymoon, intending it for her brother. Delboeuf had written the plants’ Latin names beside them at a botanist’s dictation. What seemed to be dream knowledge had been acquired through an ordinary act of attention, then lost to conscious recall.

A second discovery recovered the source of the dream’s procession of lizards. In 1877, an old illustrated magazine came into Delboeuf’s hands. It contained a picture of the entire procession as he had dreamed it fifteen years earlier, and its date, 1861, reminded him that he had subscribed to the magazine from the time it began appearing. The dream’s moving line of lizards, like its fern-name, could thus be traced to an earlier experience whose connection with the dream had not been apparent when he awoke.

Memory beyond waking recall

Freud uses the episode to support the claim that a dream can draw on recollections unavailable to the waking person. The dream does not create its details independently: the album and magazine supply distinct prior sources, and the delayed discoveries reconnect them to the dream. The case’s force lies in the gap between possessing an impression and being able to retrieve it consciously. Delboeuf’s later recognition turns what had seemed inexplicable into evidence of memory persisting outside immediate waking access.

The example also gives an individual history to Freud’s broader account of memory. He cites the view that an impression, however insignificant, leaves a trace capable of reappearing, and argues that dream-memory makes this capacity especially visible. Delboeuf’s experiences do not merely show that dreams reproduce past material; they show that such reproduction may be altered or fragmentary, and that its origins can remain hidden until a later object or image restores the missing connection.

Fragment and reconstruction

The dream itself does not present the two sources as a clear record. Its plant-name is slightly distorted, and its succession of lizards is a dream image rather than an explicit recollection of a magazine illustration. Only the later album and magazine discoveries allow Delboeuf to reconstruct how those details entered his experience. The sequence of recognition therefore matters: first comes the puzzling dream, then the fern album, then the printed procession, with each later encounter changing what the earlier dream can be understood to contain.

Freud places this account among examples of unusually vivid or enhanced dream-memory, while distinguishing the recovery of a source from the mere appearance of knowledge in a dream. In Delboeuf’s case, both parts can be followed: the album establishes where the unfamiliar botanical name came from, and the dated magazine supplies a likely source for the lizards. The account makes forgotten experience legible without treating the dream as a literal replay. Its significance is precisely that the dream preserves traces imperfectly, while later waking discoveries make their history recoverable.