 Hartmann specifies analytically the laws that govern the various levels of reality and their connection (for a short introduction see NW; for a summary of the laws, see Poli 2011a and Peterson 2012). The laws of validity concern the scope of the validity of categorial principles (A43a), and the laws of coherence concern the holistic character of each stratum (A45b). If we take a simple organism as object of inquiry, for example, biological categories rather than physical or mental ones are primarily valid, and these saturate the organism with specifically organological forms of determination, no more (such as teleology) and no less (such as physical causality). Moreover, if we claim that metabolism belongs to a proper understanding of the organism, then aspects of every other category of organic life are entailed in it as well, codetermining and ingredient in it. With these two sets of principles, he has covered the internal coherence and determination within a stratum. These laws together imply a degree of incommensurability of categorial domains to one another, but given the all-pervasiveness of the fundamental categories, this substantive incommensurability is never total. Relations between different strata are captured in the last two sets of structural laws.