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 pressure do not seem to have affected their health at all seriously. But if they wore no clothing, yet it was in the other artificial additions to their bodily resources, certainly, that their great superiority over man lay. We men, with our bicycles and road-skates, our Lilienthal soaring-machines, our guns and sticks, and so forth, are just in the beginning of the evolution that the Martians have worked out. They have become practically mere brains, wearing different bodies according to their needs, just as men wear suits of clothes, and take a bicycle in a hurry or an umbrella in the wet. And of their appliances, perhaps nothing is more wonderful to a man than the curious fact that what is the dominant feature of almost all human devices in mechanism is absent—the wheel is absent; among all the things they brought to earth there is no trace or suggestion of their use of wheels. One would have at least expected it in locomotion. And in this connection it is curious to remark that even on this earth Nature has never hit upon the wheel, or has preferred other expedients to its development. And not only did the Martians either not know of (which is incredible), or abstain from, the wheel, but in their apparatus singularly little use is made of the fixed pivot, or relatively fixed pivot,