| Chapter 1 | Introduction: What is Philosophy of Nature in the scheme of philosophy and science
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| Chapter 2 | The subject of natural science and its intrinsic principles
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| Chapter 3 | Thomas' essay, The principles of nature
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| Chapter 4 | Chance and causality —since natural causes are the principles of demonstration
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| Chapter 5 | The meaning of motion and its various species —since motion is the basic property of natural things
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| Chapter 6 | Concepts subsidiary to motion, such as the infinite,
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| Chapter 7 | place, space, void,
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| Chapter 8 | time.
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| Chapter 9 | The three species of motion, with answers to objections to the possibility of motion
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| Chapter 10 | The divisibility of motion and rest —towards determining the efficient cause
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| Chapter 11 | The efficient cause of motion, and its requisites. Can it be eternal?
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| Chapter 12 | The existence of God: Three ways Thomas rejects, and his first 2 ways
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| Chapter 13 | The existence of God: The last 3 ways, and those in Thomas' Commentary on John
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| Chapter 14 | Readings for comparison
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| Weiseipl | Nature & gravitation
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