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 succinctly states Russell's views on a whole range of questions, from material reality and idealism to the distinctions between knowledge, error, and probable opinion, and the limits and the value of philosophical knowledge. The foreword Russell wrote in 1924 for a German translation has been added as an appendix, giving details of how some of his views had changed since The Problems of Philosophy was written. This book is intended for all students of philosophy (taught mainly at degree level); of interest to the general reader looking for a classic introduction to philosophy.