My wide-eyed, questioning stare must have conveyed my thought to him, for he laughed shortly, and said, “No, I’ve not gone insane.”

“It was an accident,” he went on with amazing calm. “My first idea was merely to build something that would reduce the necessary supervisory force to one or two humans. But, when I had almost completed my second experimental model, I found that I was out of the copper filaments necessary to wind a certain coil. I didn’t want to wait till I could obtain more from the stores, and remembered that on the inside of the door to the Death Bath there was some fine screening that could be dispensed with. I used the wire from that. Whether the secret of life as well as of death lies in those waste rays from the sun, or whether some unknown element of the humans consumed in the flame was deposited on the screening in a sort of invisible coating, I do not know. But this I do know: when that second model was finished, and the vitalizing current was turned on, things happened—queer things that could be explained only on the ground that the machine had intelligence.”