The Problems of Philosophy · Chapters

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Chapter companions for The Problems of Philosophy by Bertrand Russell.

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Chapter 1
The Problems of Philosophy
This chapter introduces the fundamental problems of philosophy, beginning with the distinction between appearance and reality. Using the example of a table, Russell illustrates how our senses provide only appearances, not the true nature of objects. He discusses Descartes' method of systematic doubt, the rational belief in the existence of matter, and the role of physical science in describing matter. The chapter also examines Berkeley's idealism, the distinction between knowledge by acquaintance and description, the principle of induction, general principles of inference, Kant's theory of a priori knowledge, and Plato's theory of universals. It concludes by considering the value of philosophy.
Chapter 2
Appearance and Reality
Russell introduces the fundamental philosophical problem of distinguishing appearance from reality, using a table as a concrete example to show that sense-data (colors, textures, shapes) vary with perspective, lighting, and the observer, leading to doubt about the nature of physical objects. He raises two central questions: whether matter exists and, if so, what its nature is. Berkeley's idealism is presented as a key challenge to common-sense realism, arguing that the 'real' table may be an idea in the mind of God rather than an independent material substance.
Chapter 3
II: The Existence of Matter
Russell examines whether physical objects exist independently of our sense-data. He begins by affirming the certainty of immediate experiences (sense-data) and introduces Descartes' method of systematic doubt. While we cannot logically prove the existence of matter, instinctive belief in an external world is natural and useful for systematizing our experiences. Russell concludes that such belief is reasonable, as it harmonizes with other instinctive beliefs and simplifies our account of reality.
Chapter 4
III: The Nature of Matter
This chapter examines the nature of the physical world that persists independently of our perceptions. It begins by reaffirming the rational belief that sense-data are signs of an external reality, then turns to physical science's account of matter as something defined solely by position and motion in a neutral, public space. The chapter argues that the intrinsic qualities of physical objects—such as color, sound, and even the space we directly experience—are not part of the scientific world; rather, they are effects of wave-motions and other processes on our senses. It concludes by considering the idealist view that matter is fundamentally mental, a position to be critically examined in the next chapter.
Chapter 5
Idealism
Russell examines and critiques the doctrine of idealism, particularly as advocated by Bishop Berkeley. He distinguishes between sense-data and physical objects, argues that Berkeley's central fallacy lies in confusing the act of apprehension with the object apprehended, and defends the possibility of knowledge of things that are not mental.

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The Problems of Philosophy

Appearance and Reality

II: The Existence of Matter

III: The Nature of Matter

Idealism