First published in 1951, In Defence of Reason is a series of philosophical essays written at various times. Some of them are devoted to the interpretation of Kant's philosophy, a subject which the author has made specially his own. Many of them, however, are concerned with more general topics, among which may be mentioned fashion and philosophy, self-identity, and Existentialism as an attitude to life. The main interest throughout is the defence of reason against views which reduce man to a plaything of circumstances and make his moral judgments the mere expression of non-rational emotions. This book will appeal to students and researchers of philosophy.