A keener appreciation of natural beauty led to a study of natural science; thence it was but a step to the "night-sides" of nature; and spiritism, mesmerism, occultism, and abnormal psychology fill the minds of such men as the Romantic philosopher Schubert, and of the physicians Carus and Passavant. Justinus Kerner wrote of the Seeress of Prevorst, and Clemens Brentano watched for years at the bedside of a stigmatized nun. On the other hand, from nature comes a love for home and country, and this love serves as a bridge to the patriotism which was the vital force in the Wars of Liberation and which, by well-marked gradations, destroyed the cosmopolitanism engendered by the French Revolution. Art went hand in hand with nature; the wild, weird landscapes of Caspar David Friedrich, fascinating and specifically German, express the Romantic spirit fully as well as the delicate, spiritual, and thoroughly sane fancies of Philip Otto Runge, the artist of early Romanticism. As the earlier men centred in Jena, so the later Romanticists flourished in Heidelberg, that city which Eichendorff called "itself a magnificent Romanticism." The earlier group was largely North German and brought with it clear perception and a certain power of analysis, an ability to dissect and to reason. With the Heidelberg group the South begins to play a larger part, though there were a number of North Germans in it. The richer fancy, the longer literary tradition, now add color to their productions. It is significant, too, that though "castle Romanticism" does not die out, a new note is struck with the celebration of the Rhine in song, story, and legend. The river begins with Romantic tradition and in a Romantic _milieu_, but rises to political significance as "Germany's stream and not Germany's boundary." The southward tendency of the movement reached its climax when its centre shifted to Munich, with a culture-loving king, an Academy of Sciences and a new University. Munich was fortunately not destined to become like Vienna, that other South German city, "a Capua of the spirit."