Winslow reported before the Academie Royale des Sciences the history of a girl of twelve who died at the Hotel-Dieu in 1733.

She was of ordinary height and of fair conformation, with the exception that hanging from the left flank was the inferior half of another girl of diminutive proportions.

The supernumerary body was immovable, and hung so heavily that it was said to be supported by the hands or by a sling.

Urine and feces were evacuated at intervals from the parasite, and received into a diaper constantly worn for this purpose.

Sensibility in the two was common, an impression applied to the parasite being felt by the girl.