I remember a seminar held at the University of Heidelberg, soon after Hitler came to power. Karl Jaspers, who was shortly to lose his professorship because he had committed the crime of Rassenschande—in other words, because he had married a Jewess—was discussing a student's essay on Hegel's philosophy. He said: “In these days when we hear all too much about race, I advise you to read X's book on ‘race among the herrings’. You will then see what we know about race today, when human passions are not involved.”