Primarily, the compass was used for geomancy for a long time before it was used for navigation Ancient Chinese alchemists realized that the magnetite ore would ... in a simplified form. The inner ...

History of Chinese Medicine: being a Chronicle of Medical Happenings in China from Ancient Times to the Present Period. By Dr. K. Chimin Wong Dr. Wu Lien-Teh. Pp. xviii + 706 + 55 plates.