Past experience suggested that the great wings were a part of some ingenious mechanical device, for the limitations of the human mind, which is alway… - Edgar Rice Burroughs

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Past experience suggested that the great wings were a part of some ingenious mechanical device, for the limitations of the human mind, which is always loath to accept aught beyond its own little experience, would not permit him to entertain the idea that the creatures might be naturally winged and at the same time of human origin.