I reconstruct Aristotle’s explanation for why and how birds are capable of natural flight. For Aristotle, air is a markedly different external resting point in comparison with water and earth, and nature has designed birds so as to take advantage of the unique way in which air affects the inequality between the pushing downward, that is, the downward force and the resistance. My discussion sheds some light on Aristotle’s anticipation of some aspects of modern fluid dynamics and aerodynamics.

Aristotle’s Meteorology 4.12 is puzzling, in part because the chapter appears to extend teleological explanation to include certain inorganic materials without natural biological functions, such as metals and stone. This paper examines two attempts to explain why such materials can have functions, and shows that they are problematic. As an alternative, I argue that raw inorganic materials—as well as separated parts of organisms—can have extrinsic functions. Extrinsic functions can explain why natural inorganic materials can be sorted into natural kinds, even (...) if their functions are ultimately related to their uses in the productive arts. (shrink)

The dominant interpretation ofMetaphysicsΘ.8 commits Aristotle to the claim that the heavenly bodies’ eternal movements are not the exercises of capacities. Against this, I argue that these movements are the result of necessarily exercised capacities. I clarify what it is for a heavenly body to possess a nature and argue that a body’s nature cannot be a final cause unless the natural body possesses capacities that are exercised for the sake of its naturequaform. This discussion yields a better understanding of (...) what capacities are, what explanatory work capacities do, and what it is to possess a nature. (shrink)

Proposes an innovative rethinking of Aristotle’s work as a system that integrates his theology with his doctrine of reproduction and life. In this deep rethinking of Aristotle’s work, Abraham P. Bos argues that scholarship on Aristotle’s philosophy has erred since antiquity in denying the connection between his theology and his doctrine of reproduction and life in the earthly sphere. Beginning with an analysis of God’s role in the Aristotelian system, Bos explores how this relates to other elements of his philosophy, (...) especially to his theory of reproduction. The argument he develops is that in talking about the cosmos, Aristotle rejected Plato’s metaphor of artisanal production by a divine Demiurge in favor of a biotic metaphor based on the transmission of life in reproduction, in which pneuma—not breath as it is often interpreted but the life-bearing spirit in animals and plants—plays a key and sustaining role as the vital principle in all that lives. In making this case, he defends the authenticity of the treatises De Mundo and De Spiritu as Aristotle’s, and demonstrates Aristotle’s works as a unified system that sharply and comprehensively refutes Plato’s, and in particular replaces Plato’s doctrine of the soul with a theory in which the soul is clearly distinguished from the intellect. “Bos offers a fresh, interesting, and important perspective. His interpretation will be very controversial, but if he is right, the standard Anglo-American interpretation of Aristotle will have to change radically.” — Malcolm Wilson, author of Structure and Method in Aristotle’s Meteorologica: A More Disorderly Nature. (shrink)

The main concern of this paper is the problem of method in De Caelo, which has been recently invigorated by the supposition of Aristotle’s acceptance of two standards of justification. Whereas the φυσικῶς argument comes close to demonstrative knowledge, the εὐλόγως argument relies on more general assumptions and allegedly points towards argumentative justification. With a view to better understanding how empirical criteria for theories, teleological principles, and the resolution of difficulties are laid down to provide as much causal explanations as (...) possible, we take side here in the debate about the very purpose of Aristotle’s using of justification by argument in scientific contexts. Our main claim is that although only reasonable proofs can be worked out in empirically underdetermined domains, this in no way amounts to endorsing an alternative to the norms of inquiry Aristotle upholds in natural science. (shrink)

By defending the following views – that Aristotle identifies the generator and perhaps the obstacle remover as an essential cause of the natural sublunary elemental motion in Physics VIII 4; that this view is consistent with the view of Physics II 1 that the sublunary simple bodies have a principle of internal motion; and that the sublunary and the celestial elements have a nature in the very same way – I shall offer what has so far eluded Aristotelian commentators: a (...) consistent interpretation of Aristotle's theory of the natural motions of the sublunary and also the celestial elements. (shrink)