The tricolored system had long since disappeared in our upward flight. We were passing through the neighborhood of a great many worlds which were very different from our Earth. Some of them appeared to be entirely covered with water, and peopled by aquatic beings; others, occupied entirely by plants. We stopped near several of them. What unimaginable variety! The inhabitants of one of them seemed to me especially beautiful. Urania apprised me of the fact that their organization was totally different from that of the children of Earth, and that those human beings could discern the physico-chemical operations which take place in the maintenance of the body. In our earthly organism we do not see, for example, how the food absorbed is assimilated,--how the blood, tissues, and bones renew themselves; all functions are fulfilled instinctively, without thought perceiving it. Thus man suffers from a thousand maladies whose origin is hidden, and often undiscoverable. There the human being feels the action of his vital nourishment as we feel pleasure or pain. A nerve starts from every particle of his body, so to speak, which transmits the different impressions it receives to the brain. If terrestrial man were endowed with such a nervous system, looking into his organism through the intermediary of the nerves, he would see how food transforms itself into chyle, the latter into blood, blood into flesh, muscular, nervous substance, etc.: he would see himself! But we are very far from that, the centre of our perceptions being obstructed by nerves, thickened by cerebral lobes and optic thalami. On another globe which we crossed during the night--that is to say, on the side of its nocturnal hemisphere--human eyes are so constructed as to be _luminous_, and shine as though some phosphorescent emanation radiated from their strange centres. A night meeting comprising a large number of these persons presents an extremely fantastic appearance, because the brilliancy, as well as the color, of the eyes changes with the different passions by which they are swayed. More than that, the power of their glance is such that they exert an _electric_ and magnetic influence of variable intensity, and which under certain conditions has the effect of lightning, causing the victim upon whom the force and energy of their will is fixed to fall dead.