machine we saw, and the lid and the shaft! They were just remote outlying things, and those creatures we have seen and fought with no more than ignorant peasants, dwellers in the outskirts, yokels and labourers half akin to brutes. Down below! Caverns beneath caverns, tunnels, structures, ways. . . . It must open out, and be greater and wider and more populous as one descends. Assuredly. Right down at the last the central sea that washes round the core of the moon. Think of its inky waters under the spare lights—if, indeed, their eyes need lights! Think of the cascading tributaries pouring down their channels to feed it! Think of the tides upon its surface, and the rush and swirl of its ebb and flow! perhaps they have ships that go upon it, perhaps down there are mighty cities and swarming ways, and wisdom and order passing the wit of man. And we may die here upon it, and never see the masters who must be—ruling over these things! We may freeze and die here, and the air will freeze and thaw upon us, and then—! Then they will come upon us, come on our stiff and silent bodies, and find the sphere we cannot find, and they will understand at last too late all the thought and effort that ended here in vain!"