The patches of moonlight on the floor, I noted, had become curiously shaded; the faces of my companions opposite were not so clearly visible as before; and the forehead and cheeks of Colonel Wragge were glistening with perspiration. I realised further, that an extraordinary change had come about in the temperature of the atmosphere. The increased warmth had a painful effect, not alone on Colonel Wragge, but upon all of us. It was oppressive and unnatural. We gasped figuratively as well as actually.

“You are the first to feel it,” said Dr. Silence in low tones, looking across at him. “You are in more intimate touch, of course⁠—”