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Difficulty 33 states: The liver is green and corresponds to Wood; the lungs are white and correspond to Metal. When placed in water, the liver sinks, whereas Wood floats; when placed in water, the lungs float, whereas Metal sinks. What is the rationale behind this? The answer is: The liver is not purely Wood; it corresponds to Yi (Yin Wood) and Jue (Wood note), representing the Yin counterpart to Geng (Yang Metal). In broad terms, this reflects the relationship of Yin and Yang; in specific terms, it reflects the relationship of husband and wife. The liver releases its slight Yang and absorbs slight Yin Qi, thus its inclination favors Metal. Furthermore, as it traverses the Yin pathways more frequently, this causes the liver to sink in water. The lungs are not purely Metal; they correspond to Xin (Yin Metal) and Shang (Metal note), representing the Yin counterpart to Bing (Yang Fire). In broad terms, this reflects the relationship of Yin and Yang; in specific terms, it reflects the relationship of husband and wife. The lungs release their slight Yin and marry toward Fire, thus their inclination favors Fire. Furthermore, as they traverse the Yang pathways more frequently, this causes the lungs to float in water. Why do the cooked lungs sink again, and the cooked liver float again? From this, we know that Xin should return to Geng, and Yi should return to Jia.

Difficulty 34 states: Do the Five Zang organs each have distinct colors, sounds, odors, and tastes that can be clearly understood? The answer is: The *Shi Bian* (Ten Transformations) states: The liver's color is green, its odor is fishy/musky, its taste is sour, its sound is a cry/shout, and its fluid is tears; the heart's color is red, its odor is scorched, its taste is bitter, its sound is speech, and its fluid is sweat; the spleen's color is yellow, its odor is fragrant, its taste is sweet, its sound is singing, and its fluid is saliva; the lungs' color is white, its odor is raw/fishy, its taste is pungent, its sound is weeping, and its fluid is nasal mucus; the kidneys' color is black, its odor is putrid, its taste is salty, its sound is groaning, and its fluid is spit. These are the colors, sounds, odors, and tastes of the Five Zang organs.
The Five Zang organs house the Seven Spirits; what does each store? The answer is: The Zang organs are the abodes where the body's Shen Qi resides and stores. Thus, the Liver stores Hun (Ethereal Soul), the Lungs store Po (Corporeal Soul), the Heart stores Shen (Spirit), the Spleen stores Yi (Intellect/Thought) and Zhi (Will/Memory - *Note: Traditional text often lists Yi and Zhi for Spleen/Kidney differently, here following the source text "Yi and Zhi"*), and the Kidneys store Jing (Essence) and Zhi (Will/Firmness).

Difficulty 35 states: Each of the Five Zang organs has an associated Fu organ, and the Fu organs are generally close to each other, yet the Heart and Lungs are uniquely distant from the Large Intestine and Small Intestine. Why is this? The answer is: The Classics state that the Ying (Nutritive) Qi of the Heart and the Wei (Defensive) Qi of the Lungs circulate through the intestinal Qi; therefore, they reside in the Upper Jiao. The Large and Small Intestines transmit Yin Qi downward; therefore, they reside in the Lower Jiao. This is why they are far apart.
Furthermore, all Fu organs belong to Yang and are places of purity. Now, the Large Intestine, Small Intestine, Stomach, and Bladder all receive impure substances. What is the meaning of this? The answer is: That statement is incorrect. The Classics state: The Small Intestine is the Fu organ of reception and storage; the Large Intestine is the Fu organ of transmission and passage; the Gallbladder is the Fu organ of purity; the Stomach is the Fu organ of water and grain; the Bladder is the Fu organ of fluids. One Fu organ does not have two names; thus, we know the previous statement is wrong. The Small Intestine is the Fu of the Heart; the Large Intestine is the Fu of the Lungs; the Gallbladder is the Fu of the Liver; the Stomach is the Fu of the Spleen; the Bladder is the Fu of the Kidneys.
The Small Intestine is called the Red Intestine, the Large Intestine is called the White Intestine, the Gallbladder is called the Green Intestine, the Stomach is called the Yellow Intestine, and the Bladder is called the Black Intestine. These are governed by the Lower Jiao.