“At two o’clock in the morning I felt so hungry and tired that I decided to give up the experiment and wait no longer. I drank some milk and went upstairs to bed. I felt flat and disappointed. I fell asleep at once and must have slept for about an hour, when I awoke suddenly with a great noise in my ears. It was the noise of my own laughter! I was simply shaking with merriment. At first I was bewildered and thought I had been laughing in dreams, but a moment later I remembered the drug, and was delighted to think that after all I had got an effect. It had been working all along, only I had miscalculated the time. The only unpleasant thing then was an odd feeling that I had not waked naturally, but had been wakened by someone else⁠—deliberately. This came to me as a certainty in the middle of my noisy laughter and distressed me.”

“Any impression who it could have been?” asked the doctor, now listening with close attention to every word, very much on the alert.

Pender hesitated and tried to smile. He brushed his hair from his forehead with a nervous gesture.