On the basis of a detailed study of the posthumous works of Georg Christoph Lichtenberg, Krapf shows that this learned man of the eighteenth century was not a mere humorist but anticipated psychoanalytic thinking so thoroughly that he might in justice be called an extemporaneous psychoanalyst. Krapf makes detailed reference to the psychological method and doctrines of Lichtenberg, stressing especially his remarks on dreams and pointing out his profound understanding of the importance of instinctive life and the unconscious. He brings out the fact that Lichtenberg understood how revolutionary his observations