Two of the major texts in the history of tongue diagnosis are presented and put into context in this volume, reaffirming the strength of tongue diagnosis as a core diagnostic tool. These key texts are made available to western readers for the first time, with the original Chinese text shown alongside the translation. The author provides an excellent overview of the history of tongue diagnosis in Chinese medicine, going back to earliest times, and discusses significant developments and publications. The Gold Mirror Records, first published in 1341, was a popular manual for centuries, appearing in many editions and variations. Tongue Reflections in Cold Damage, first published in 1668, developed the field of diagnosis as a whole by adopting the analysis of tongue colour as its main principle. Both texts are introduced with meticulous English translations and notes. This seminal text will give practitioners and students of Chinese medicine a sound understanding of the theory and practice of tongue diagnosis from the early texts, and will be of interest to academic readers of classic Chinese texts.