“What do you mean?” I exclaimed.
“Don’t be alarmed. I’ve known for some time who did it. The processes of elimination, you know. Well, I can’t prove it now, but I think I know now that all the others didn’t.”
In spite of his last remarks I was strengthened in my determination to find Davidson and tell him to be careful. What if he were caught red-handed, so to speak, trying to conceal the arsenic? In a case of the sort, motive, combined with circumstantial evidence, has convicted many a man. Any one who had seen him and Catherine together a few hours before could hardly doubt that he had motive to do far more.
Lewis must have felt what was in my mind. He suddenly began to talk about everything under the sun: flowers, trees, grass, land-tax and death duties, and to move with the most mad
