Part A of this essay deals with the logic of the humanities. These disciplines are, unlike the natural sciences, 'meta'-intentional. Interpretations, rule-following, rationality and knowledge, primarily attributed to scientists/ the members of the community of investigators, must in social science also be acknowledged at the level of the objects investigated. In these sciences one has to do with sentences that describe intentional relations-to-world; sentences of the form 'indirect speech', belief-sentences etc. An objective of A is to direct attention to Ludwig Wittgenstein's philosophy - in...