speak to Remnant, he had let his eyes drop for an instant. He looked down towards the trees in the garden, and saw with utter astonishment that one had changed its shape in the few hours that had passed since the setting of the sun. There was a thick grove of ilexes bordering the lowest terrace, and above them rose one tall pine, spreading its head of sparse, dark branches dark against the sky. 

 As Lewis glanced down over the terraces he saw that the tall pine tree was no longer there. In its place there rose above the ilexes what might have been a greater ilex; there was the blackness of a dense growth of foliage rising like a broad and far-spreading and rounded cloud over the lesser trees. 

 Here, then was a sight wholly incredible, impossible. It is doubtful whether the process of the human mind in such a case has ever been analyzed and registered; it is doubtful whether it ever can be registered. It is hardly fair to bring in the mathematician, since he deals with absolute truth (so far as mortality can conceive absolute truth); but how would a mathematician feel if he were suddenly confronted with a two-sided triangle? I suppose he would instantly become a raging madman; and Lewis, staring wide-eyed and wild-eyed at a dark and spreading tree which his own experience informed him was not there, felt for an instant that shock which should affront us all when we first realize the intolerable antinomy of Achilles and the Tortoise. Common sense tells us that Achilles will flash past the tortoise almost with the speed of the lightning; the inflexible truth of mathematics assures us that till the earth boils and the heavens cease to endure the Tortoise must still be in advance; and thereupon we should, in common decency, go mad. We do not go mad, because, by special grace, we are certified that, in the final court of appeal, all science is a lie, even the highest science of all; and so we simply grin at Achilles and the Tortoise, as we grin at Darwin, deride Huxley, and laugh at Herbert Spencer. 

 Dr. Lewis did not grin. He glared into the dimness of the night, at the great spreading tree that he knew could not be there. And as he gazed he saw that what at first appeared the dense blackness of foliage was fretted and starred with wonderful appearances of lights and colors. 

 Afterwards he said to me: “I remember thinking to myself: ‘Look here, I am not delirious; my temperature is perfectly normal. I am not drunk; I only had a pint of Graves with my dinner, over three hours ago. I have not eaten any poisonous fungus; I have not taken Anhelonium Lewinii 

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