William James - The Principles of Psychology, 2 Volumes | Macmillan & Co. Ltd. For sale: The Principles of Psychology by William James, complete in two volumes. Published by Macmillan and Co., Ltd., London. Both volumes are present: Vol. I and Vol. II. This is one of the most important works in the history of psychology and philosophy of mind, written by William James, Professor of Psychology at Harvard University. The set belongs to an early Macmillan edition/reprint of this landmark work. Condition: good overall condition for its age. The original blue cloth bindings are preserved, with gilt lettering on the spines. There is age-related wear to the spine ends, corners and covers, as shown in the photos. The internal pages are generally clean, with natural age toning.Dedication / Provenance: Includes a handwritten dedication related to a Greek official of the Embassy of Greece in Cairo, Egypt, during the Second World War, adding historical and collectible interest to the set. Please note: this is not being sold as a confirmed first edition. Buyers are welcome to inspect the photos carefully. A valuable set for collectors, researchers, students of psychology, philosophy, history of science, or bibliophiles interested in classic academic works.