At the turn of the last century, C.G. Jung began his career as a psychiatrist. During the next decade three men whose names are famous in the annals of medical psychology influenced his professional development: Pierre Janet, under whom he studied at the Salpetriere Hospital in Paris; Eugen Bleuter, his chief at the Burgholzli Hospital in Zurich; and Sigmund Freud, whom Jung met in 1907. It is Bleuter, and to a lesser extend Janet, whose influence bears on the studies in descriptive and experimental psychiatry composing Volume 1 of the Collected Works. This book contains papers that appeared between 1902 and 1905.