This book is a clear instruction of the tongue in the context of its relationship to the internal organs and the eight principles. It includes the details of tongue spirit, body colour, shape and coating, case histories and 40 plates. The text is in relationship to principles of Shan Han Lun the Wen Re Lun and the Three Burners classification. New sections show the use of the tongue in diagnosing emotional problems and herbal therapy - also with children.