At this time the universities were still agitated by the Liberal and patriotic aspirations aroused by the War of Liberation; at Breslau Leo fell under the influence of Jahn, and joined the political gymnastic association (Turnverein); at Jena he attached himself to the radical wing of the German Burschenschaft, the so-called "Black Band," under the leadership of Karl Follen.
The murder of Kotzebue by Karl Sand, however, shocked him out of his extreme revolutionary views, and from this time he tended, under the influence of the writings of Hamann and Herder, more and more in the direction of conservatism and romanticism, until at last he ended, in a mood almost of pessimism, by attaching himself to the extreme right wing of the forces of reaction.
So early as April 1819, at GÃ¶ttingen, he had fallen under the influence of Karl Ludwig von Haller's Handbuch der allgemeinen Staatenkunde (1808), a text-book of the counterRevolution.
Haupt, Karl Follen and die Giessener Schwarzen (Giessen, 1907); W.
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