"The nearer I got to him, the funnier I felt, and I began to be afraid that I would go out. No. 9764 got up out of bed, and I could see him grinning at me through the bowl. He reached up and adjusted that bowl, and all of a sudden I realized that whatever was knocking me out was not affecting him because he had that thing on. I jumped for him with the idea of taking the bowl off and putting it on my own head. He saw what I was up to and he fought like a cornered rat, but the blackness hadn't affected my muscles. I'm a pretty big man, sir, and No. 9764 is a little runt, and it didn't take me long to get the bowl off his head and pulled on over mine. As soon as I did that, I seemed to be able to think clearer. I was sitting on No. 9764 and was ready to tap him with a persuader if he started anything, but I didn't have to. In a few minutes he stopped struggling and lay perfectly quiet. "The lights kept getting dimmer and dimmer until they went out altogether and the room became pitch dark. It wasn't exactly as if the lights had gone out, sir; I seemed to know that they were still there and were burning as bright as ever, but they couldn't penetrate the blackness in the room, if you understand what I mean." * * * * * "I think I do," said Dr. Bird slowly. "It was a good deal as if you had seen a glass filled with a pale red liquid and someone had dumped black ink into the fluid and hid the red color. You would know that the red was still there, but you wouldn't be able to see it through the black." "That's exactly what it was like, Doctor; you have described it better than I can. At any rate, after it got real dark I heard a low whistle from the roof. No. 9764 made a struggle to get up for a moment and then lay quiet again. The whistle sounded again and then I heard some one call 'Caruso.' Everything was quiet for a while and then the same voice called again and said some stuff in a foreign language that I couldn't understand. I kept perfectly quiet to see what would happen. "For about ten minutes the room remained perfectly dark, as I have said, and all the while I could hear that whining noise. All of a sudden it began to sound in a lower note and then I could see the lights again, very dimly and like the black ink you spoke of was fading out. The note got lower until it stopped altogether, and the lights came on brighter until they were normal again. Then I heard a scraping noise on the roof and the noise I had heard at first like a big electric fan. I looked at the clock. It was two-twenty.