"delirium tremens. He positively saw snakes now"

Delirium tremens is a state of profound confusion and trembling usually caused by withdrawal from alcohol or drugs. Hallucinations are a common part of it. Visions of snakes and spiders are recorded as the most common visions, although sufferers can see anything, even pink toads, as the chief engineer of the Patna sees in Conrad’s 1900 novel, Lord Jim