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This 1867 survey of philosophy is enlivened by portraits and discussions of Thales, Pythagoras, Socrates, Plato, Aristotle, and Euclid, through more modern philosophers such as David Hume and Immanuel Kant, ending with Auguste Comte. Sections focus on topics, such as the nature of the universe and the origin of knowledge, and groups, such as the Sophists and the Cynics.