And Then There Were None vocabulary

Out of it she took a small glass-stoppered phial, that a scientific friend had given her long ago for use in case of extreme emergency. It contained prussic acid.

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No distinctive smell of Prussic Acid, probably Potassium Cyanide.

Agatha Christie. And Then There Were None. p.51 (1939)

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(Many most attractive and enthusiastic women also commit suicide by stabbing, drowning, drinking prussic acid, aconite, arsenic, opening their veins, refusing food, casting themselves under steamrollers, from the top of Nelson’s Pillar, into the great vat of Guinness’s brewery, asphyxiating themselves by placing their heads in gasovens, hanging themselves in stylish garters, leaping from windows of different storeys.)