The paper provides a new characterization of the concepts of necessity and contingency as they should be used in the historical context. The idea is that contingency (necessity) increases in direct (reverse) proportion to sensitivity to initial conditions. The merits of this suggestion are that it avoids the conflation of causality and necessity (or contingency and chance), that it enables the bracketing of the problem of free will while maintaining the concept of human action making a difference, that it sanctions (...) tendencies without recourse to teleology, and that it recasts the controversy between historicists and anti‐historicists in less dogmatic language. (shrink)

The ontological dependence of one domain on another is compatible with the explanatory autonomy of the less basic domain. That autonomy results from the fact that the relationship between two domains can be very complex. In this paper I distinguish two different types of complexity, two ways the relationship between domains can fail to be transparent, both of which are relevant to evolutionary biology. Sometimes high level explanations preserve a certain type of causal or counterfactual information which would be lost (...) at the lower level; I argue that this is central to the proper understanding of the adaptationist program. Sometimes high level kinds are multiply realised by lower level kinds: I argue that this is central to the understanding of macroevolution. (shrink)