Dennis Des Chene's Physiologia: Natural Philosophy in Late Aristotelian and Cartesian Thought reconstructs the discourse of late scholastic natural philosophy, and assesses Descartes' agreements and disagreements. In a critical discussion, I offer a different interpretation of late scholastic theories of final causality and of God's concursus with created efficient causes. Fonseca's and Suárez' conceptions of final causality in nature depend on their claim that a single action can be the action of two agents at once--in particular, of God and of (...) a creature. I discuss both their theory of action and its implications for natural teleology. I then compare Descartes, emphasizing his demolition of the Aristotelian hierarchy of causes, with unmoved movers regulating the action of inferior moved movers. Aristotle argues that unmoved causes are needed to produce a stable world-order; he takes arts as his models of unmoved causes, and uses this model to support natural teleology. Descartes radically simplifies this system by denying all unmoved movers other than God, and denying anything analogous to an art in non-human nature. I explore the implications for Descartes' notion of concursus and his criticism of natural teleology, and discuss his resulting difficulties in explaining natural stability. (shrink)

I first examine John Duns Scotus’ view of contingency, pure possibility, and created possibilities, and his version of the celebrated distinction between ordained and absolute power. Scotus’ views on ethical natural law and his account of induction are characterised, and their dependence on the preceding doctrines detailed. I argue that there is an inconsistency in his treatments of the problem of induction and ethical natural law. Both proceed with God’s contingently willed creation of a given order of laws, which can (...) be revoked and replaced with a new order of laws. In the case of ethical natural law God promulgated the Decalogue, for example; in the case of nature, there are physical laws that can be known by induction. Scotus exalts the freedom of God and the mutability of ethical natural law in order to explain exceptions to it disclosed by revelation (for example, the Old Testament command to Abraham to kill Isaac). Yet he treats ethical natural laws as (mostly) not universal and immutable. In contrast, he holds that we can arrive at knowledge of the universal and immutable laws of nature, except for those regularities that result from free will. Finally, I present several ways of characterising this tension between Scotus’ doctrines. (shrink)