English summary: In his study of radical Chinese reformer Tan Sitong (1865-1898), Ingo Schaefer uniquely demonstrates to what extent his writings reflect the overall social transformation process during the late Qing period. They are characterized by a twofold movement, taking place on the one hand in the deconstruction and reconstruction of autochthonous political and philosophical concepts (eg. Confucianism, Buddhism, Daoism, Mohism) and...