airs of a popular and cheerful character. He is fond, but not morbidly fond, of reading—chiefly fiction pervaded with a vaguely pious optimism—sleeps well, and rarely dreams. He is, in fact, the very last person to evolve a fantastic fable. Indeed, so far from forcing this story upon the world, he has been singularly reticent on the matter. He meets inquirers with a certain engaging—bashfulness is almost the word, that disarms the most suspicious. He seems genuinely ashamed that anything so unusual has occurred to him.
It is to be regretted that Plattner's aversion to the idea of post-mortem dissection may postpone, perhaps for ever, the positive proof that his entire body has had its left and right sides transposed. Upon that fact mainly the credibility of his story hangs. There is no way of taking a man and moving him about in space as ordinary people understand space, that will result in our changing his sides. Whatever you do, his right is still his right, his left his left. You can do that with a perfectly thin and flat thing, of course. If you were to cut a figure out of paper, any figure with a right and left side, you could change its sides simply by lifting it up and turning it over. But with a solid it is different. Mathematical theorists tell us that the only way in which the right and left sides of a solid body can be changed is by taking that body clean out of space as we know it—taking it out of ordinary existence, that is, and turning it somewhere outside space. This is a little abstruse, no doubt, but any one with acknowledge of mathematical theory will assure the reader of its truth. To put the thing in technical language, the curious inversion of Plattner's right and left sides is proof that he has moved out of our space into what is called the Fourth Dimension, and that he has returned again to our world. Unless we choose to consider ourselves the victims of an elaborate and
