The colours were dancing before John Lethbridge's eyes in dots and splashes. The place was so hot that beads of perspiration were standing out on his forehead, and his dark hair was wet and dank. He lifted his head from the tray in front of him and stretched himself wearily. This thing was a long time in doing, and patience was not one of his virtues. He glanced at the thermometer, which registered almost a hundred degrees. It was nearly as hot outside, for a thunderstorm was coming up from the south, and the night was dark and tepid.Lethbridge lifted the lights of the little greenhouse higher, but he was conscious of no change in the temperature. Even the fresh mesh of muslin thrown over the ventilators seemed to keep out what air was there.