I saw at once what Lemarchant had done. He had emptied out the quinine and replaced it by some other white powder, probably arsenic. But a little of the quinine still adhered to the folds in the paper, because he had been obliged to substitute it hurriedly; and that at once proved that it was no mistake of my own, but that Lemarchant had really made the deliberate attempt to poison me.

This is a confession, and a confession only, so I shall make no effort in any way to exculpate myself for the horrid crime I committed the next moment. True, I was wild with fever and delirium; I was maddened with the thought that this wretched man would marry Dora; I was horrified at the idea of sleeping in the same room with him any longer. But still, I acknowledge it now, face to face with a lonely death upon this frozen island, it was murder—wilful murder. I meant to poison him, and I did it.

"He has set this powder for me, the villain," I said to myself, "and now I shall make him take it without knowing it. How do I know that it's arsenic or anything else to do him any harm? His blood be upon his own head, for aught I know about it. What I put there was simply quinine. If anybody has changed it, he has changed it himself. The pit that he dug for another, he himself shall fall therein."

I wouldn't even test it, for fear I should find it was arsenic, and be unable to give it to him innocently and harmlessly.

I rose up and went over to Lemarchant's side. Horror of horrors, he was sleeping soundly! Yes, the man had tried to poison me; and when he thought he had seen me swallow his poisonous powder, so callous and hardened was his nature that he didn't even lie awake to watch the effect of it. He had dropped off soundly, as if nothing had happened, and was sleeping now, to all appearance, the sleep of innocence. Being convalescent, in fact, and therefore in need of rest, he slept with unusual soundness.

I laid the altered powder quietly by his pillow, took away his that I had laid out in readiness for him, and crept back to my own place noiselessly. There I lay awake, hot and feverish, wondering to myself hour after hour when he would ever wake and take it.

At last he woke, and looked over towards me with unusual interest. "Hullo, Doctor," he said quite genially, "how are you this morning, eh? getting on well, I hope." It was the first time during all my illness that he had ever inquired after me.

I lied to him deliberately to keep the delusion up. "I have a terrible grinding pain in my chest," I said, pretending to writhe. I had sunk to his level, it seems. I was a liar and a murderer.

He looked quite gay over it, and laughed. "It's nothing," he said, grinning horribly. "It's a good symptom. I felt just like that myself, my dear fellow, when I was beginning to recover."

Then I knew he had tried to poison me, and I felt no remorse for my terrible action. It was a good deed to prevent such a man as that from ever carrying away Dora—my Dora—into a horrid slavery. Sooner than that he should marry Dora, I would poison him—I would poison him a thousand times over.