First published in 1912, this classic introduction to the subjects of philosophical inquiry has proved invaluable to the formal student and general reader alike. It has Russell's views succinctly stated on material reality and idealism, knowledge by acquaintance and by description, induction, knowledge of general principles and of universals, intuitive knowledge, truth and falsehood, the distinctions between knowledge, error, and probable opinion, and the limits and the value of philosophical knowledge.