Although much has been written about the 12 regular channels and their place in the diagnosis and treatment of disease, little has been written since the days of the Huang Di Nei Jing about the secondary systems of channels and collaterals. Such omissions have left a great void in the knowledge, application, and research in the subject of channels and collaterals. Even since the foundation of the People's Republic of China, and the establishment of its system of TCM colleges, more than 95 per cent of modern acupuncture textbooks have concentrated solely on the 12 regular channels. This book completes all the other text and fills this cap.