title: Folding into being: early embryology and the epistemology of rhythm.
abstract: Historians have often described embryology and concepts of development in the period around 1800 in terms of "temporalization" or "dynamization". This paper, in contrast, argues that a central epistemological category in the period was "rhythm", which played a major role in the establishment of the emerging discipline of biology. I show that Caspar Friedrich Wolff's epigenetic theory of development was based on a rhythmical notion, namely the hypothesis that organic development occurs as a series of ordered rhythmical repetitions and variations. Presenting Christian Heinrich Pander's and Karl Ernst von Baer's theory of germ layers, I argue that Pander and Baer regarded folding as an organizing principle of ontogenesis, and that the principle's explanatory power stems from their understanding of folding as a rhythmical figuration. In a brief discussion of the notion of rhythm in contemporary music theory, I identify an underlying physiological epistemology in the new musical concept of rhythm around 1800. The paper closes with a more general discussion of the relationship between the rhythmic episteme, conceptions of life, and aesthetic theory at the end of the eighteenth century.
authors.affiliation: Leuphana Universität Lüneburg, MECS - Medienkulturen der Computersimulation, Wallstraße 3, 21335, Lüneburg, Germany, janina.wellmann@leuphana.de.
authors.forename: Janina
authors.initials: J
authors.lastname: Wellmann
mesh_terms: D004626:Embryology / Q000266:history*; D005858:Germany; D049671:History, 18th Century; D049672:History, 19th Century; D006801:Humans; D019359:Knowledge; D012426:Russia