She was the granddaughter of Henry and Dulcibella Dodwell and co-heiress of the Morant estate in Jamaica, which formed part of her marriage settlement.

[4] Retiring to England, Crichton wrote several books dealing with medical and geological subjects, becoming a member of the Royal Geographical Society in 1819.

Crichton's extensive collection of minerals consisted mainly of specimens from Siberia, Russia, Norway, Hungary, Germany, the UK, the US and India.

And the other a disorder of low power, arousal, or selective/oriented attention closely resembling that of cognitive disengagement syndrome (CDS), in his book An inquiry into the nature and origin of mental derangement: comprehending a concise system of the physiology and pathology of the human mind and a history of the passions and their effects (1798).

Crichton died at The Groves, near Sevenoaks, and was buried at West Norwood Cemetery, where his monument is a gabled granite slab.