Jung began his career as a psychiatrist in 1900, when he was twenty five as an assistant in the cantonal mental hospital and clinic of the University of Zurich. It was only six years later, after he had become senior staff physician of the Burgholzi Hospital and an associate of Dr Eugene Bleuler, that Jung wrote his famous monograph ‘On the Psychology of Dementia Praecox’. A.A. Brill has called this work indispensable for every student of psychiatry - ‘the work which firmly established Jung as a pioneer and scientific contributor to psychiatry’. Ernest Jones described it as ‘a book that made history in psychiatry and extended many of Freud’s ideas into the realm of the psychosis proper’. An earlier translation by Dr Brill has been out of print for many years. This volume of the Collected Works of C.G. Jung now makes this key study in medical psychology again available, in an entirely new translation by R.F. C. Hull. Grouped together with it are nine other papers in psychiatry, the earliest being ‘The Content of the Psychoses’, written in 1908, when Jung was a leading member of the early psychoanalytical movement. The latest are two papers written in 1956 and 1958 , which embody his conclusions after many years of experience in the psychotherapy of schizophrenia (the term introduced by Professor Bleuler for dementia praecox). These studies reflect the original techniques especially associated with Jung’s name.