The change in the quality of the daylight increased, and the crowd gazed about the horizon in wonder. A purplish darkness, born of nothing more than a spectral deepening of the sky's blue, pressed down upon the rumbling hills. Then the lightning flashed again, somewhat brighter than before, and the crowd fancied that it had showed a certain mistiness around the altar-stone on the distant height. No one, however, had been using the telescope at that instant. The whippoorwills continued their irregular pulsation, and the men of Dunwich braced themselves tensely against some imponderable menace with which the atmosphere seemed surcharged.