It was at this time that men, in their effort to carry themselves from place to place, seem to have taken the first hints from nature. It was remembered that _between_ swimming and flying, and _between_ flying and walking, certain forms of locomotion, quite rapid withal, are used by our poor relatives on land and sea. Thus the flying-fish rises from the water and shoots, quite parabolically, for some distance through the air. The genus Cheiroptera also gives a hint of progress by means of wings that are not made of feathers. The flying lemur, nearly akin to _Homo bifurcans_, shows how one may rise and go by a sort of aërial progress along the ground. Out of these hints the men of Am-ri-ka, at the epoch of which we speak, sought inventions by means of which they might keep close to the ground for safety, but otherwise fly; for the age was very fast! Under these conditions some Unknown Man invented what was called the By-sigh-kel. It was a sort of flat-sided, rotary ground-skimmer, very thin and notorious. It came coincidently with another invention called the Trol-lee. The latter was an electrical wagon for general travel in cities and suburbs, while the By-sigh-kel was a personal carriage for one or possibly two. The passenger in this case had to start his machine and then jump on. The propulsion was effected by a pump-like action of the legs, very tiresome and elegant. The passenger generally leaned forward in a position strongly suggestive of the favorite attitude of his arboreal ancestors. It was the peculiarity of the Trol-lee that it made a sort of humming roar as it went that sounded like a hundred prisoners groaning in unison; but the By-sigh-kel made no noise in going except in collisions and wrecks. The latter were so frequent that a whole cycle of restorative arts had to be undertaken of which the principal was dentistry. At the close of the century there were few front teeth remaining--except artificials. Many accounts of the Age of the By-sigh-kel and Trol-lee have been preserved among the old records of Am-ri-ka, and traditions of it are found in the antiquarian papers of other countries. We have seen pictorial representations made by Fo-to-graf-ure of scenes from the age referred to. The streets of extinct cities are found pictured in this way. There was an instrument called the Cow-dack which was used in taking pictures in an instantaneous manner, so that the scene would look like life.