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xii it entirely if they find some one passage opposed to their preconceived notions. I can hardly expect any one to agree with me in all points. I trust, however, that this seemingly fantastic tale may encourage the young to study in more serious works the facts of astronomical science, and perhaps cheer their elders with the thought that, though much is sad on Earth, yet there may be brighter worlds than this, and a happier existence than we can have here. Earth is not the Universe, and our life here is not eternity.