"This book has two parts. The first gives the substance of lectures delivered in the Psychological Laboratory at Cambridge in the summer of 1919, and repeated in the spring of the present year at the Phipps Clinic of the Johns Hopkins Medical School, Baltimore, under the direction of Professor Adolf Meyer. The second part consists of appendices in which are republished occasional papers written as the result of clinical experience gained during the war. A few alterations have been made in these, chiefly in order to bring the terminology into line with that adopted in the body of the book, and in the second Appendix the original paper has been amplified. A few of the opinions expressed in these appendices differ in some respects from those of the lectures, but have been left as originally stated because they present alternative points of view which may possibly be nearer the truth than those adopted as the result of later deliberation. The general aim of the book is to put into a biological setting the system of psycho-therapy which came to be generally adopted in Great Britain in the treatment of the psycho-neuroses of war. This system was developed in the main at the Maghull Military Hospital under the direction of Dr. R. G. Rows"--Preface. (PsycINFO Database Record (c) 2006 APA, all rights reserved).