The first edition of this book quickly established itself as a classic for the secondary vessels of acupuncture , giving a detailed description of the meridians of acupuncture beyond the twelve principal ones. The book also investigates the formation of the chi and other energies, and deals with perverse energy and its effects on the body and the internal pathways and re-union points. Now, in its second edition, Royston Low has updated this classic text and has included references and further reading.