Diagrammatology investigates the role of diagrams for thought and
knowledge. Based on the general doctrine of diagrams in Charles Peirce's
mature work, Diagrammatology claims diagrams to constitute a centerpiece of
epistemology. The book reflects Peirce's work on the issue in Husserl's
contemporanous doctrine of "categorial intuition" and charts the many
unnoticed similarities between Peircean semiotics and early Husserlian
phenomenology. Diagrams, on a Peircean account, allow for observation and
experimentation with ideal structures and objects and thus furnish the
access to the synthetic a priori of the regional and formal ontology of the
The second part of the book focusses on three regional branches of
semiotics: biosemiotics, picture analysis, and the theory of literature.
Based on diagrammatology, these domains appear as accessible for a
diagrammatological approach which leaves the traditional relativism and
culturalism of semiotics behind and hence constitutes a realist semiotics.