Page:Lord Dunsany - The Sword of Welleran.djvu/185

THE GHOSTS straight lines cut one another," I said, "the opposite angles are equal. Let AB, CD, cut one another at E, then the angles CEA, CEB equal two right angles (prop. xiii.). Also CEA, AED equal two right angles."

I moved towards the door to get the revolver; a hideous exultation arose among the beasts. "But the angle CEA is common, therefore AED equals CEB. In the same way CEA equals DEB. Q.E.D." It was proved. Logic and reason re-established themselves in my mind, there were no dark hounds of sin, the tapestried chairs were empty. It seemed to me an inconceivable thought that a man should murder his brother. 151