"Let me tell you, then, the train of reasoning which passed through my mind in Baker Street. The idea of a vampire was to me absurd. Such things do not happen in criminal practice in England. And yet your observation was precise. You had seen the lady rise from beside the child's cot with the blood upon her lips."
"I did."
"Did it not occur to you that a bleeding wound may be sucked for some other purpose than to draw the blood from it? Was there not a Queen in English history who sucked such a wound to draw poison from it?"
"Poison!"
"A South American household. My instinct felt the presence of those weapons upon the wall before my eyes ever saw them. It might have been other poison, but that was what occurred to me. When I saw that little empty quiver beside the small bird-bow, it was just what I expected to see. If the child were pricked with one of those arrows dipped in curare or some other devilish drug, it would mean death if the venom were not sucked out.
"And the dog! If one were to use such a poison, would one not try it first in order to see that it had not lost its power? I did not foresee the dog, but at least I understood him and he fitted into my reconstruction.
"Now do you understand? Your wife feared such an attack. She saw it made and saved the child's life, and yet she shrank from telling you all the truth, for she knew how you loved the boy and feared lest it break your heart."
"Jacky!"
"I watched him as you fondled the child just now. His face was clearly reflected in the glass of the window where the shutter formed a background. I saw such jealousy, such cruel hatred, as I have seldom seen in a human face."
"My Jacky!"