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"The Man Who Evolved" is a science fiction short story by Edmond Hamilton that was first published in the April 1931 issue of ''Wonder Stories''. In his comments on the story in ''Before the Golden Age'', Isaac Asimov called it the first science fiction short story (as opposed to novel) that impressed him so much it stayed in his mind permanently. In her introduction to ''The Best of Edmond Hamilton'', Leigh Brackett called the story "a fine example of Hamilton's skill in encapsulating an enormous theme into the neat and perfect compass of a short story." ==Plot summary== The narrator, Arthur Wright, and his friend Hugh Dutton visit their former classmate, Dr. John Pollard at his combination house/laboratory. Pollard, a classic mad scientist, has been conducting research into the question of what causes the mutations that drive evolution. Pollard informs them that he has determined that cosmic rays are the source of the mutations, and that he has decided that bombarding himself with heavy concentrations of cosmic rays will cause him to evolve into a future version of humanity. (As Asimov notes in ''Before the Golden Age'', cosmic rays do indeed play a part in causing mutations, but they cause evolutionary changes in large populations rather than individual organisms. Though Pollard claims to have done "something no physicist has been able to do, to concentrate the cosmic rays and yet remove from them their harmful properties", this is merely handwaving. Subjecting oneself to a concentrated blast of cosmic rays would, as Asimov notes, simply result in one's death, something that was known perfectly well even in the early 1930s.) Pollard has built himself a cosmic-ray-concentrator that will allow him to evolve at the rate of 50 million years every 15 minutes exposure, but he needs someone else to operate it, which is why he has invited Wright and Dutton to his laboratory. Wright reluctantly agrees to operate Pollard's device. Fifteen minutes in the device leave Pollard with enhanced intelligence and a highly developed physique. However, he is eager to continue the process and explore the further evolutionary changes mankind will undergo. The next stage, though, finds him with a huge bald head atop a frail body and atrophied emotions. He insists on continuing, and each stage of the process finds his brain larger and more powerful, and his body smaller and weaker. At each stage Pollard derides the previous stage as brutish and primitive, praises his current condition and looks forward to the next stage in his evolution. After the third transformation Pollard's ambition is to enslave humanity and turn the Earth into a vast laboratory for his own use, but as the transformations proceed he moves beyond such desires, with only intellectual curiosity remaining. The penultimate stage finds Pollard transformed into a vast, naked telepathic brain that feeds on pure energy. A final use of the device, to Wright's shock, leaves Pollard a pool of protoplasm, apparently bringing the evolution of humanity full circle back to its beginning. Dutton goes mad with horror and wrecks the laboratory, and Wright barely pulls him out before it, and Pollard's house, go up in flames. Dutton remains permanently mad, while Wright is left to wonder whether Pollard really has simply returned to humanity's starting point. "Or is this evolutionary cycle we saw a cycle in appearance only, is there some change that we cannot understand, above and beyond it? I do not know which of these possibilities is truth, but I do know that the first of them haunts me." 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「The Man Who Evolved」の詳細全文を読む スポンサード リンク
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