PSYCHOLOGY is with difficulty seeking recognition as a science, and the books before us suggest some reasons for the difficulty. Its tenets are often a matter of personal predilection and it has not yet obtained the right, conceded to other sciences only after bitter struggle, to pursue its aims irrespective of prejudice or the supposed moral or immoral sequelae of its findings. Adler (i) exemplifies the personal element at its strongest, and opens with a preface which repels by its claim of the infallibility of individual psychology that is to say, of the psychology of Adler. “We shall never agree,” he says, “to change the fundamentals of human psychology which it has established and to adopt others in its stead.” (1) The Practice and Theory of Individual Psychology. By Alfred Adler. Translated by Dr. P. Radin. (International Library of Psychology, Philosophy, and Scientific Method.) Pp. viii + 352. (London: Kegan Paul and Co., Ltd.; New York: Harcourt, Brace and Co., Inc., 1924.) 18s net. (2) Essays in Applied Psycho-Analysis. By Dr. Ernest Jones. (The International Psycho-Analytical Library, No. 5.) Pp. vi + 454. (London: G. Allen and Unwin, Ltd.; Vienna: International Psycho-Analytical Press, 1923.) 18s. net. (3) Psychology and Morals: an Analysis of Character. By J. A. Hadfield. Second edition. Pp. vii + 186. (London: Methuen and Co., Ltd., 1923.) 6s. net. (4) Abnormal Behavior, Pitfalls of our Minds: an Introduction to the Study of Abnormal and Anti-Social Behavior. By Dr. Irving J. Sands Dr. Phyllis Blanchard. Pp. ix + 482. (London: G. Routledge and Sons, Ltd., 1923.) 16s. net.