This book aims at telling the educated public what psychology is. Its scope is wide, ranging from an account of the Müller-Lyer illusion to biographies of leading psychologists. Much of it is in the form of question and answer, the first being 'What is a psychological laboratory?' There are a great many references to psycho-analysis, and one chapter is devoted to the subject. The author's attitude towards it is distinctly ambivalent. On the one hand we read that 'The domain of mind has been revolutionized largely through the originality and efforts of one man—Sigmund Freud, whose seventieth anniversary has recently been celebrated throughout the civilized world' (p. 105). On the other hand, we are not encouraged to expect much understanding when we read 'What is the meaning of psycho-analysis? Answer. Psycho-analysis consists in analysing a supposed hidden factor by means of a series of questions from out the deepest recesses of a person's mind' (p. 67). The scepticism of the academic is justified by