The various phases of the development of the animal and vegetable kingdoms on our globe, these perfected organized species each succeeding the other, and finally reaching the superior type which we call man, must, in our opinion, have been produced in the selfsame order, upon the other planets of our solar world. M. Flammarion proves, in the work which we have already quoted, that the physical and climatological constitution of the planets is similar to that of our globe. There is therefore no reason why things should have taken place otherwise in Mercury, Jupiter, or Venus, than in the Earth, in respect to the successive order of the creation and appearance of living beings, and, in our belief a precisely similar successive appearance of vegetables and animals, has taken place in these planets. The plants and animals of Mercury, Jupiter, Saturn, &c., were certainly not identical with those species which have had existence on the Earth, and perhaps no resemblance could be traced between them, but all, in their successive appearance, obeyed the principle of progress and perfecting. Life, commencing in the burning waves of the primitive seas, subsequently manifested itself upon the continents. Animals of aërial organization have lived upon these continents, their species have by degrees reached the perfection of their type, at length, and finally, a creature appeared in these planets more complete, superior in organization, intelligence, and sensibility to all the animal creation which formed the population of each particular globe. This superior being, this last step of the ascending scale of living creation proper to the planetary worlds, the corresponding analogous creature to terrestrial man, we shall take leave to call _planetary man_. In all the planets, then, there exist _men_, as on the earth, just as there exist animals which are inferior to that noble and privileged type. According to the views which we have explained at the commencement of this work, terrestrial man undergoes, after his death, a glorious metamorphosis. Leaving his miserable material covering here below, his soul springs upward into space, and becomes incarnate in a new being, whose type is infinitely superior, by reason of its moral perfection, to that of our poor humanity. He becomes that which we have called the _superhuman being_. If this be true of the terrestrial man, it must be equally true of the planetary man. So that the superhuman being must proceed, not only from the earth, but from all the other planets.