QUOTE : I shall describe one example of this kind of world, the greatest planet of a mighty sun. Situated, if I remember rightly, near the congested heart of the galaxy, this star was born late in galactic history, and it gave birth to planets when already many of the older stars were encrusted with smouldering lava. Owing to the violence of solar radiation its nearer planets had (or will have) stormy climates. On one of them a mollusc-like creature, living in the coastal shallows, acquired a propensity to drift in its boatlike shell on the sea’s surface, thus keeping in touch with its drifting vegetable food. As the ages passed, its shell became better adapted to navigation. Mere drifting was supplemented by means of a crude sail, a membrane extending from the creature’s back. In time this nautiloid type proliferated into a host of species. Some of these remained minute, but some found size advantageous, and developed into living ships. One of these became the intelligent master of this great world. The hull was a rigid, stream-lined vessel, shaped much as the nineteenth-century clipper in her prime, and larger than our largest whale. At the rear a tentacle or fin developed into a rudder, which was sometimes used also as a propeller, like a fish’s tail. But though all these species could navigate under their own power to some extent, their normal means of long-distance locomotion was their great spread of sail. The simple membranes of the ancestral type had become a system of parchment-like sails and bony masts and spars, under voluntary muscular control. Similarity to a ship was increased by the downward-looking eyes, one on each side of the prow. The mainmast-head also bore eyes, for searching the horizon. An organ of magnetic sensitivity in the brain afforded a reliable means of orientation. At the fore end of the vessel were two long manipulatory tentacles, which during locomotion were folded snugly to the flanks. In use they formed a very serviceable pair of arms.