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Dryness and dampness differ as much as heaven and earth. Dryness is the Qi of Heaven, while dampness is the Qi of Earth. In spring, the Qi of the Earth rises and dampness prevails; in autumn, the Qi of Heaven becomes solemn and dryness prevails. Therefore, after the Spring Equinox, dampness governs, and after the Autumn Equinox, dryness governs. Why does the *Huangdi Neijing* (Yellow Emperor's Inner Canon) state "Autumn injury by dryness" (Qiu shang yu zao), mistakenly written as "dampness"? Later scholars failed to notice this error and all claimed "Autumn injury by dampness." If this were true, one would have to regard the summer heat as cold. Only Yu Jia Yan (Yu Chang, courtesy name Jiayan) alone corrected this millennium-old doubt, asserting that it should be: "Spring injury by wind, Summer injury by summer-heat, Late Summer injury by dampness, Autumn injury by dryness, Winter injury by cold," distributing the Six Qi across the four seasons. Regarding autumn dryness, he stated that autumn does not become dry immediately; rather, after intense heat, coolness arises. As coolness emerges and heat dissipates, gradually becoming very cool, the command of dryness then takes effect. This seems similar to Shen's theory that "contracting coolness in autumn causes dryness disease." However, regarding medication, Yu formulated Qing Zao Jiu Fei Tang (Clear Dryness Rescue Lung Decoction), using only Yin-nourishing and cooling agents. He also stated that diseases arising in autumn are due to dryness injury, where Metal suffers from Fire punishment. Furthermore, he claimed dryness is identical to fire-heat and differs from cold-dampness. So how should one reconcile these views?

The nature of dryness Qi is cool. Observe that during midsummer when summer-heat steams, the body sweats and remains moist; in late autumn when great coolness arrives, the skin becomes dry. Thus, *Xingli Daquan* states that dryness belongs to secondary cold. Those contracting this pathogen enter first through the Taiyang (Greater Yang) exterior. Consequently, symptoms such as fever, slight headache, and chills with shivering manifest as Taiyang channel syndromes. One should follow the *Neijing* principle: "When dryness dominates, treat with bitter-warm," using formulas like Xiang Su San (Fragrant Perilla Powder) to disperse the pathogen from the exterior. This aligns with Yu's view that "great coolness leads to the command of dryness" and Shen's view that "contracting coolness in autumn causes dryness disease." However, people only know that initial pathogens enter via the Taiyang exterior, failing to realize that the meridians and organs corresponding to the current season subsequently receive the pathogen and become diseased. Since the skin and hair are the exterior correspondence of the Lung, the classic text says: "Autumn injury by dryness causes upward rebellion and cough, leading to flaccidity and syncope." This indicates that in autumn, the Lung is affected first.

In individuals with Yin deficiency and pre-existing Lung heat, their Jin-Ye (Body Fluids) are inevitably insufficient. If they further contract external dryness, the dryness intensifies. Dryness belongs to Metal. Below the position of Metal, Fire Qi attacks. Thus, after the great coolness of late autumn, warmth returns in the tenth month; this warmth arises from dryness. When dryness and heat combine, Lung Qi loses its clear, descending, and purifying function, leading to upward rebellion causing cough and wheezing, chest fullness and obstruction, difficulty swallowing food leading to vomiting, Lung heat scorching the leaves resulting in flaccidity syndrome, and Qi rebellion causing dizziness and collapse (Jue syndrome). This explains why Yu Jiayan said "disease begins in autumn, injuring dryness, Metal suffers Fire punishment," and "dryness is akin to fire-heat."

In summary, Shen's argument concerns contracting the coolness of late autumn dryness, hence using bitter-warm herbs to release the exterior. Yu's argument addresses individuals who are chronically Yin-deficient with Lung heat and dried fluids, who then suffer autumn dryness, causing dryness-heat combination; thus, Yin-nourishing and cooling methods are used. These two theories seem opposite but are actually not contradictory.

Furthermore, Yu Jiayan stated: Left hypochondriac pain, inability to turn the side, dry throat, dusty complexion, lack of luster in the body, lower back pain, and tendon contraction, blurred vision, and sores are all root causes of dryness originating in the Liver, appearing variably. This is due to Lung Metal suppressing Liver Wood. Therefore, treating dryness disease requires distinguishing between the Lung and Liver organs. If the Lung Metal is primarily diseased, urgent and focused effort must be made to rescue the Lung, without delaying or dividing efforts. If the Liver shows dryness symptoms first, urgent rescue of the Liver is needed to prevent scorched damage. However, clearing the Lung is also addressing the root, as dryness Qi first injures the Upper Jiao Huagai (Lung). Observing that plants change appearance upon encountering Metal Qi, the Upper Jiao is affected first. Hence, the Lung is called the "Delicate Organ," fearing both cold and heat. Cold injuries account for 20-30%, while heat-fire injuries account for 70-80%. Cold merely binds externally, whereas heat-fire scorches internally, causing double the harm.

Heat-fire injuring the Lung causes Qi stagnation, leading to severe dryness diseases characterized by flaccidity, wheezing, vomiting, and rebellion. Using acrid-aromatic Qi-moving drugs at this stage increases dryness, ignoring the consumption of Yin Qi, which is akin to wielding a knife against life. However, treating dryness disease requires distinguishing whether the pathogen is in the Exterior or Interior. There is dryness in the Exterior presenting as skin cracking and peeling, and dryness in the Interior presenting with exhaustion of Essence and Blood. These must be differentiated. For miscellaneous diseases accompanied by dryness symptoms, drying agents must be strictly contraindicated. Many suffer from dryness disease today. In the past, Zhong Chun (Chen Shigong's son) favored moistening agents, achieving immediate efficacy. Dryness disease invariably involves thirst. Although etiologies vary, the result is always the loss of Jin-Ye due to dryness-heat. The Classics state: "Excess dryness leads to dryness." And: "All astringency, withering, drying, spasms, and cracking belong to dryness." Students should examine this carefully.

**Qiang Fang Xiang Su San** [See Shanghan]: Treats autumn contraction of coolness causing fever, slight headache, and chills, termed dryness disease. This formula treats late autumn external contraction of dryness; modify according to symptoms.

**Qing Zao Jiu Fei Tang** (Clear Dryness Rescue Lung Decoction): Treats autumn injury by dryness causing upward rebellion and cough, leading to flaccidity and syncope. Also treats various Qi stagnations [stagnation causing wheezing, constraint causing fullness], various flaccidity syndromes, wheezing, and vomiting. All belong to Lung dryness.
* **Sang Ye** (Folium Mori, Mulberry Leaf): [Use mulberry leaves that remain moist and do not wither after frost] as the Sovereign herb to clear Lung heat.
* **Shi Gao** (Gypsum Fibrosum, Gypsum): Minister herb. Each 5 qian.
* **Mai Dong** (Radix Ophiopogonis, Ophiopogon Root): 3-5 qian.
* **Hu Ma** (Semen Sesami Nigrum, Black Sesame Seed): 2 qian, slightly crushed.
* **Sheng Ji Zi Bai** (Albumen Ovum, Egg White): Moisten Lung dryness. Two eggs. The original formula uses Ejiao (Donkey-hide Gelatin), but authenticity is doubtful.
* **Xing Ren** (Semen Pruni Armeniacae, Apricot Seed): 1 qian, peeled, core removed, crushed.
* **Pi Pa Ye** (Folium Eriobotryae, Loquat Leaf): Directs rebellious Qi downward. Remove hairs, honey-fried. 3-4 slices.
* **Gan Cao** (Radix Glycyrrhizae, Licorice Root): Harmonizes Stomach Qi. 1 qian.
* **Ren Shen** (Radix Ginseng, Ginseng Root): Rescues Lung Qi injured by heat, generates Stomach fluids. 3-5 fen.
Take frequently. [Like watering scorched earth to save a fire, frequent administration provides relief.] Add Zi Su Zi (Fructus Perillae) for rebellious Qi, Bai He (Bulbus Lilii) for increased cough, Bei Mu (Bulbus Fritillariae Cirrhosae) and Gua Lou (Fructus Trichosanthis) for increased phlegm, or add Niu Huang (Calculus Bovis, Calculus Bos Taurus) if necessary. Add Li Zhi (Fructus Pyri, Pear Juice) for chest fullness. [Moistens dryness, clears heat, removes chest obstruction.] Add Mao Gen (Rhizoma Imperatae, Imperata Rhizome) for urgent wheezing. [Cools Metal, calms wheezing.] Add Lu Gen (Rhizoma Phragmitis, Reed Rhizome) for vomiting/rebellion. [Clears heat, directs downward.] Add Sheng Di Huang (Radix Rehmanniae Preparata, Prepared Rehmannia Root) for blood exhaustion; add Xi Jiao (Cornu Rhinocerotis, Rhino Horn) and Ling Yang Jiao (Cornu Saigae Tataricae, Saiga Antelope Horn) for severe heat. [Both treat heat oppression.]
This formula clears the Lung, moistens dryness, directs Qi downward, and harmonizes the Stomach. It consists entirely of sweet-cold herbs. Yu Jiayan stated: Various Qi stagnations belonging to the Lung belong to Lung dryness. Yet ancient and modern formulas for Qi stagnation mix acrid-aromatic Qi-moving drugs. Even for flaccidity, wheezing, and vomiting belonging to the Upper Jiao, which belong to Lung dryness, modern treatments attribute flaccidity and vomiting to the Yangming channel, reserving wheezing solely for the Lung. Treating Lung wheezing involves either releasing the exterior or purging downward, moving Qi or draining Qi. No formula specifically treats Lung dryness. Rarely are moistening agents used, and even then, they miss the mark. Even Li Dongyuan, though virtuous, only nourished Ying-Blood, tonified Liver-Kidney, and opened blockages in his dryness formulas, never mentioning the Lung. This was because the *Neijing* omitted dryness syndromes, leading to uncritical adherence. My proposed formula focuses mainly on Stomach Qi. The Stomach is the Mother of the Lung. While Tian Dong (Radix Asparagi) can protect the Lung, its bitter taste and stagnant Qi may harm the Stomach and obstruct phlegm. Zhi Mu (Rhizoma Anemarrhenae) nourishes Kidney Water but is also bitter and thus avoided. Bitter-cold fire-purging drugs, though standard treatments, are especially contraindicated. When the Lung is extremely dry and hot, remaining Yin Qi is scarce. Using bitter-cold drugs to drain Qi and harm the Stomach leaves no room for survival. Modifications should follow this pattern to rescue the Lung from dryness-induced complications. Note: Ancient Er Dong Gao (Two Winter Pastes) treats blood deficiency and Lung dryness, skin cracking, and Lung fei with pus/blood expectoration excellently, preserved with white honey, avoiding bitterness.

**Yang Yin Qing Re Run Zao Tang** (Nourish Yin Clear Heat Moisten Dryness Decoction) [Self-made]: Treats dryness-heat from exhaustion of Essence and Blood.
* **Er Di** (Radix Rehmanniae Preparata & Radix Rehmanniae Recens, Prepared and Raw Rehmannia Roots): Tonify Yin, cool blood.
* **Er Dong** (Radix Asparagi & Radix Ophiopogonis, Asparagus and Ophiopogon Roots): Clear heat, moisten dryness.
* **Shan Yao** (Rhizoma Dioscoreae, Yam Rhizome): Tonify Spleen, moisten dryness.
* **Hei Zhi Ma** (Semen Sesami Nigrum, Black Sesame), **Rou Cong Rong** (Herba Cistanche, Cistanche Herb), **Niu Nai** (Ovis Lac, Cow's Milk): Tonify blood, moisten dryness.
This formula nourishes the Kidney, strengthens vitality, clears heat, and moistens dryness. Kidney and Liver dryness diseases can be treated by modifying this formula. Yu Jiayan stated: If Kidney Water is sufficient to ascend and interact with Heart Fire, Heart Fire descends to interact with Kidney Water, preventing transmission to the Lung, what fear of dryness injury exists? Even if Kidney Water is insufficient, if Intestine-Stomach fluids and blood are sufficient to assist and supply upwards, the Lung will not be excessively injured. If the waters of the Middle and Lower Jiao are completely exhausted, expecting the water of the High Source to remain stable is impossible. Therefore, treating dryness requires knowing to tonify Kidney Water, purge Heart Fire, and eliminate Stomach Heat.

**Yang Ying Run Zao Tang** (Nourish Ying Moisten Dryness Decoction) [Self-made]: Treats skin cracking, brittle nails, tendon spasm, scabies, tinea, and dry leprosy.
* **Sheng Di Huang** (Radix Rehmanniae Preparata, Prepared Rehmannia Root), **Dang Gui** (Radix Angelicae Sinensis, Chinese Angelic Root): Nourish Ying-Blood; Blood moistens the body.
* **Sheng Huang Qi** (Radix Astragali Membranacei, Astragalus Root), [Tonify Wei-Qi; Qi warms the body.]
* **Er Dong** (Radix Asparagi & Radix Ophiopogonis, Asparagus and Ophiopogon Roots): Clear Lung, moisten dryness, lustrify muscle.
* **Qin Jiao** (Radix Gentianae Macrophyllae, Gentian Root): Nourish blood, activate collaterals, relax tendons.
* **Gan Ju** (Flos Chrysanthemi Indici, Chrysanthemum Flower): Treat dead skin.
* **Shou Wu** (Radix Polygoni Multiflori Preparata, Prepared Fleeceflower Root): Treat widespread scabies/tinea.
* **Fang Feng** (Radix Saposhnikoviae, Saposhnikovia Root): A moistening agent among Wind-dispelling herbs.
* **Bo He** (Herba Menthae Haplocalycis, Mint Herb): A pungent-cooling agent among Exterior-releasing herbs. These two serve as Assistants to unblock the Cou-Li (interstices).
* **Lu Dou** (Semen Phaseoli Radiati, Mung Bean): Sweet-cold, moistens skin.
This formula primarily clears the Lung, nourishes blood, and moistens dryness, assisted by herbs that unblock the Cou-Li. Although dryness is in the Exterior, it is fundamentally due to Lung Metal dryness-heat and decline of Ying-Blood, failing to moisten muscles and nourish tendons.