He continued to gaze into the sky with screwed-up eyes, though the object had become invisible. If his eye could really have followed the thing after which he gazed, he would have been surprised; if his unfathomable scepticism was still capable of surprise. It passed over woods and meadows like a sunset cloud towards the sunset, or a little to the north-west of it, like the fairy castle that was west of the moon. It left behind the green orchards and the red towers of Hereford and passed into bare places whose towers are mightier than any made by man, where they buttress the mighty wall of Wales. Far away in this wilderness of columned cliffs and clefts it found a cleft or hollow, along the floor of which ran a dark line that might have been a black river running through a rocky valley. But it was in fact a crack opening below into another abyss. The strange flying ship followed the course of the winding fissure till it came to a place where the crack opened into a chasm, round like a cauldron and accidental as the knot in some colossal tree-trunk; through which it sank, entering the twilight of the tremendous cavern beneath. The abyss below was lit here and there with artificial lights, like fallen stars of the underworld, and bridged with wooden platforms and galleries, on which were wooden huts and huge packing-cases and many things somewhat suggestive of a munition dump. On the rocky walls were spread out various balloon coverings, some of them of even more grotesque outline than the castle. Some were in the shapes of animals; and on that primeval background looked like the last fossils, or possibly the first outlines of vast prehistoric creatures. Perhaps there was something suggestive in the fancy that in that underworld a new world was being created. The man who alighted from the flying castle recognized, almost as one recognizes a domestic pet, the outline of a highly primitive pig stretching like a large archaic drawing across the wall. For the young man was called Hilary Pierce, and had had previous dealings with the flying pig, though for that day he had been put in charge of the flying castle. On the platform on which he alighted stood a table covered with papers, with almost more papers than Lord Eden’s table. But these papers were covered almost entirely with figures and numbers and mathematical symbols. Two men were bending over the table, discussing and occasionally disputing. In the taller of the two the scientific world might have recognized Professor Green, whom it was seeking everywhere like the Missing Link, to incarcerate him in the interests of science. In the shorter and sturdier figure a very few people might have recognized Bellew Blair, the organizing brain of the English Revolution. “I haven’t come to stay,” explained Pierce hastily. “I’m going on in a minute.” “Why shouldn’t you stay?” asked Blair, in the act of lighting a pipe.