The Principles of Psychology Volume 1, complete with William James' original notes, illustrations, tables and charts clarifying the theory described and arguments made. Appearing in 1890, The Principles of Psychology was a landmark text which established psychology as a serious scientific discipline. William James' compiled a convincing, lengthy and broad thesis, devoting detail and vigorous analysis in every chapter. The text's comprehensiveness and superb presentation played a pivotal role in bringing the science of mental health closer toward the scholarly mainstream. The entire book is set out intuitively: there are two volumes, each of which has a certain number of chapters. While some chapters have sub-sections, James is careful not to make his textbook dry or convoluted in organisation. Each chapter introduces, discusses and concludes on a particular subject - whether it be the role of psychology as an academic and medical discipline, or the various functions of the human brain.