Aristotle on fixed species in the book 1 of his Parts of Animals.

What is it about?

In this note, I argue that, contrary to some recent interpretations put forward, Aristotle is in fact theoretically committed to fixed species in biology, even if his actual practice found in his biological works seems to suggest otherwise. At least in Book 1 of his Parts of Animals, in his philosophical discussion of biology, Aristotle favors the methodology that reflects his theoretical commitment to fixed species.

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Why is it important?

If the view proposed in this note is correct, then it will challenge how we should understand Aristotle's biological works in relation to his metaphysical and epistemological views, such as his view on essence and scientific knowledge.