Thallium

Thallium is a chemical element with the symbol Tl and atomic number 81. Thallium and its compounds are extremely toxic, and should be handled with care. Thallium compounds have a high aqueous solubility and are readily absorbed through the skin.

Characters poisoned with thallium

 * Corrigan? - The Pale Horse (Another Corrigan, not Ginger nor Jim)
 * "Ginger" Corrigan - The Pale Horse (survived)
 * Jessie Davis - The Pale Horse
 * Mary Delafontaine - The Pale Horse
 * Harmondsworth - The Pale Horse
 * Lady Minnie Hesketh-Dubois - The Pale Horse
 * Ormerod - The Pale Horse
 * Parkinson - The Pale Horse
 * Sandford - The Pale Horse
 * Shaw - The Pale Horse
 * Thomasina Tuckerton - The Pale Horse