The north is black. The water qi gets into the kidneys. The kidneys open into the ears. The essence of water is stored in the kidneys. Disease occurs to the small muscles next to the bones. The salty flavor gets into the kidneys. The property of the kidneys is like that of water. The kidneys correspond to the pig in domestic animals, legume in cereals, chen star in the sky, yu in musical scales, six in numbers, and rancid smell in odors. So it is known that diseases of the kidneys affect the bones.
Thus, an experienced doctor inspects the five zang-organs and six fu-organs meticulously, considering the favorableness, unfavorableness, yin, yang, exterior, interior, male and female. All the abstruse information is reviewed mentally. He will not teach unqualified men, nor will teach incorrect knowledge. These principles are what we should abide by.
Key Words: topic on correspondences and manifestations, Yin and Yang, the plain questions
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