When they are in doubt about a point in their past history that we have not yet reached they make preparation and forecast its occurrence in our world as we foretell eclipses and transits of Venus, and all their most accomplished historians investigate it; but if the conditions for observation have been unfavourable, or if they postpone consideration of the point till the time of its happening here has gone by, then they must wait for many years till the same combination occurs in some other world. Thus they say, “The next beheading of King Charles I will be in Ald. b. x. 231c/d”—or whatever the name of the star may be—“on such and such a day of such and such a year, and there will not be another in the lifetime of any man now living,” or there will, in such and such a star, as the case may be. Communication with a world twenty thousand years ahead of us might ruin the human race as effectually as if we had fallen into the sun. It would be too wide a cross. The people in my supposed world know this and if, for any reason, they want to kill a civilisation, stuff it and put it into a museum, they tell it something that is too much ahead of its other ideas, something that travels faster than thought, thus setting an avalanche of new ideas tumbling in upon it and utterly destroying everything. Sometimes they merely introduce a little poisonous microbe of thought which the cells in the world where it is introduced do not know how to deal with—some such trifle as that two and two make seven, or that you can weigh time in scales by the pound; a single such microbe of knowledge placed in the brain of a fitting subject would breed like wild fire and kill all that came in contact with it. And so on. An Idyll I knew a South Italian of the old Greek blood whose sister told him when he was a boy that he had eyes like a cow. Raging with despair and grief he haunted the fountains and looked into the mirror of their waters. “Are my eyes,” he asked himself with horror, “are they really like the eyes of a cow?” “Alas!” he was compelled to answer, “they are only too sadly, sadly like them.” And he asked those of his playmates whom he best knew and trusted whether it was indeed true that his eyes were like the eyes of a cow, but he got no comfort from any of them, for they one and all laughed at him and said that they were not only like, but very like. Then grief consumed his soul, and he could eat no food, till one day the loveliest girl in the place said to him: “Gaetano, my grandmother is ill and cannot get her firewood; come with me to the bosco this evening and help me to bring her a load or two, will you?” And he said he would go. So when the sun was well down and the cool night air was sauntering under the chestnuts, the pair sat together cheek to cheek and with their arms round each other’s waists.