Nietzsche wrote in a scientific culture transformed by Darwin. He read extensively in German and British Darwinists, and his own works dealt often with such obvious Darwinian themes as struggle and evolution. Yet most of what Nietzsche said about Darwin was hostile: he sharply attacked many of his ideas, and often slurred Darwin himself as "mediocre." So most readers of Nietzsche have inferred that he must have cast Darwin quite aside. But...