Biological Time, Historical Time presents a new approach to 19th century thought and literature: by focussing on the subject of time, it offers a new perspective on the exchanges between French and German literary texts on the one hand and scientific disciplines on the other. Hence, the rivalling influences of the historical sciences and of the life sciences on literary texts are explored, texts from various scientific domains - medicine, natural history, biology, history, and multiple forms of vulgarisation - are investigated. Literary texts are analysed in their participation in and transformation of the scientific imagination. Special attention is accorded to the temporal dimension: this allows for an innovative account of key concepts of 19th century culture.