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732PHYSICS The Greek title of this work, ta phusika, comes from the word for nature (phusis). It thus refers to the study of natural phenomena in general, and not just to physics in the narrow sense. In books I and III Aristotle defends and defines the concept of change. In book II he presents his doctrine of the four causes, dis-cusses the topics of chance and necessity, and argues for the existence of ends (or 'final causes") in nature. In parts of the book not included in this anthology, he discusses place, time, the void, the infinite, continuity, and the eternity of change. Finally, in book VIII he argues for the eternal existence of an "unmoved mover"-an uncaused cause of change. BOOK I 1 184a In every line of inquiry into something that has principles1 or causes or elements, we achieve knowledge-that is, scientific knowledge2-by cogniz-ing them; for we think we cognize a thing when we know its primary causes and primary principles, all the way to its elements. Clearly, then, it ...