Note 29 — Chapter XXV · The Capture
Reading edition
As I learned later, Doctor Von Blon, who was an ardent amateur photographer, often used half-gramme tablets of cyanide of potassium; and there had been three of them in his dark-room when Ada had called. Several days later, when preparing to redevelop a plate, he could find only two, but had thought little of the loss until questioned by Vance. ↩︎