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To treat various latent heat pathogens, causing cloudiness in the head and eyes, mental confusion and obstruction, and to resolve major toxins. By extracting the essence of water and soaking it in ship plank wood, repeatedly exposed to wind and sun, over a long period, sun exposure turns it green; this is to capture the Qi of the Sun, where during steaming and drying, Yin and Yang Qi condense and do not dissipate, gathering to form green. Taking it helps differentiate Yin and Yang, eliminate pathogenic heat, and harmonize the Zang-Fu organs. The Sages formulated treatments based on the nature and flavor of substances. For instance, earth from the east wall of a house is taken, dissolved in newly drawn water, and the clear liquid is drunk to treat disharmony of the Zang-Fu organs. Since the Spleen governs Earth, when the Spleen is dampened by dampness leading to diarrhea, one takes earth imbued with the True Fire of the Sun, introducing it into the Spleen. Relying on the Qi of the True Fire of the Sun to remove dampness stops vomiting and diarrhea. If fish bones are stuck in the throat flesh and cannot be removed, burning fish nets to ash and taking them mixed with new water causes the fish bones to pass immediately. For non-healing "moon eclipse sores," burning the stick used for the moon-saving drum, turning it to ash, and applying it dry to the sore leads to immediate healing. This utilizes the principle of sympathetic resonance between similar things. The "Ship Plank Green" follows the same logic.

**Ship Plank Green (Wuchan / Five Liang)** **Su You Bing Mo (Crisp Oil Cake Powder) (Yi Liang Ban / One and a Half Liang)**
Grind the above into fine powder, mix with thin flour paste to make pills the size of *Wutong* seeds. Take 40-50 pills each time, at any time, swallowed with warm wine.

To treat extreme cardiac fright-heat, resulting in loss of consciousness.
**Zhusha (Cinnabar)** **Pengsha (Borax)** **Yan Xiao (Saltpeter)** (each Er Qian Ban / Two and a Half Qian) **Jin Yin Bo (Gold and Silver Leaf)** (each Wu Pian / Five Pieces) **Naozi (Borneol)** (Yi Zi / One Character weight) **Hanshuishi (Calcitum)** **Shigao (Gypsum Fibrosum)** (each Ban Liang / Half Liang) **Fengcao (Licorice Root)** (San Qian / Three Qian)
Grind the above into fine powder. Each dose is Er Qian (Two Qian), taken with decoction of twenty grains of *Maidong* (Ophiopogon Tuber), hearts removed, as a vehicle.

The term "Gu Leng" (Chronic Cold) refers to cold that has been present for years and is firmly entrenched; "Leng" refers to extreme cold. *San Yin Fang* states: People have different innate constitutions of the Zang-Fu organs, and improper care can lead to tendencies toward either cold or heat. Hence, formulas address conditions of chronic cold and accumulated heat. Gu Leng is essentially internal cold, often caused by weakened True Qi and deficient Stomach Qi, compounded by consuming raw, cold, or icy foods, leading to deficiency-cold in the intestines and stomach. When Yin stagnates and coagulates, Yang cannot circulate properly, resulting in profuse watery diarrhea, frequent urination, clear nasal discharge, vomiting of saliva and foam, undigested food, colicky abdominal pain, and an abdomen feeling like ice. Shivering is all due to Yang deficiency and Yin excess. Zhang Zhongjing described the syndrome of Yin Toxin (*Yin Du*). Although not exactly Gu Leng, it is also caused by cold injury, manifesting as cold extremities, stiffness of the waist and back, pounding pain in the umbilical and abdominal region, throat discomfort, vomiting with difficulty in defecation, a body sensation as if beaten with a club, and a fine pulse nearly imperceptible. This arises from Kidney Qi deficiency-cold, external contraction of wind-cold, or spleen injury from cold foods. Since the Spleen belongs to Taiyin, its interior and exterior are both Yin, causing Yang to fail to guard, thus forming Yin Toxin. Symptoms include cold limbs, cold forehead and dorsal hands, incessant sweating, unbearable eye pain, cyanosis of lips, mouth, fingers, toes, and nails, Qi rushing up to the heart, and a deep, fine, hidden pulse. Some may experience irritability and thirst, mental loss, stating that "Yin excess causes cold body and sweating, trembling chills, and cold leads to Jue." It is appropriate to use warming medicines to restore Yang Qi, or moxa on *Qihai* (CV6) and *Guanyuan* (CV4). *Yi Lü* states: Cold is the utmost abundance of Yin and the utmost decline of Yang; excessive Yin is called Han. The Classics say: "For cold, use heat." Taking hot agents is the correct method for treating cold. Internally, consume extremely drying and rigid/hot medicines; externally, burn hundreds of moxa cones to expel Yin and assist Yang. This is the way to treat cold attacking from multiple directions. Generally, the human body values the ascending and descending of Yin and Yang in balance without bias, thus avoiding disease. If there is excess, it constitutes symptoms of sinking cold and chronic cold, where True Yang is dissipated, Spleen and Stomach are weak, and lack of regulation leads to Stomach cold. Consuming cold, sticky, hard-to-digest, or raw foods year after year accumulates into chronic cold, gradually damaging the Spleen and Kidneys, forming chronic diseases in the Zang-Fu. Once touched by cold pathogens, it acts suddenly, leading to cold extremities, aversion to cold, indigestion, vomiting of foam, profuse diarrhea, undigested rice/grains, frequent urination, colicky abdominal pain, cough triggered by cold, or severe hernia attacks. These are its manifestations. *Neijing* says: "When cold dominates, soothe with pungent-hot." Also, *Neijing · Ju Tong Pian* states: "Meridian Qi flows endlessly, circling without rest. When cold enters the meridians, flow slows, blood stasis occurs. If lodged outside the vessels, blood is scant; if inside, Qi is blocked, causing sudden pain." Qibo said: "Cold lodging outside vessels causes vessel cold; vessel cold causes contraction and curling; contraction causes tension; tension pulls small collaterals, causing sudden pain. Heat stops pain immediately. Repeated cold injury makes pain last." Cold lodging in meridians, clashing with heat, causes fullness, pain, and tenderness to pressure. Cold lingering with rising heat causes vessel enlargement and blood/Qi aggregation, making severe pain unpressable. Cold lodging between intestines/stomach and membrane origins prevents blood dispersion, pulling small collaterals painfully. Pressing disperses blood/Qi, stopping pain. Cold lodging in paravertebral vessels is deep; pressing is ineffective. Cold lodging in Chong Mai, originating at *Guanyuan* and rising straight up the abdomen, blocks vessels, causing Qi stagnation and palpable pulsation. Cold lodging in Back-Shu vessels causes blood stasis and deficiency, leading to pain radiating to the heart; pressing brings heat, stopping pain. Cold lodging in Jueyin vessels (connecting genitalia to Liver) causes blood stasis and vessel tension, leading to radiating pain in hypochondrium and lower abdomen. Jue Qi lodging in inner thighs, with cold reaching lower abdomen, causes blood stasis and radiating abdominal pain to inner thighs. Cold lodging in Small Intestine membrane/collaterals causes blood stasis, preventing flow into large vessels, leading to accumulation over time. Cold lodging in five Zang organs causes rebellious Qi leakage, exhaustion of Yin, failure of Yang entry, sudden death-like pain; recovery of Qi brings life. Cold lodging in intestines/stomach causes rebellious Qi upward, leading to painful vomiting. Cold lodging in Small Intestine prevents proper digestion/accumulation, causing diarrhea and abdominal pain. Cold closes pores, blocks airways, causes Qi convergence, and cold accumulation becomes chronic cold. *Zhi Shi Fang* states: Diet is primary, medicine secondary. Lack of dietary control and unchecked desires cause stagnation in organs, forming chronic ailments, hence "sinking cold and chronic cold." Symptoms include seminal emission in men, leukorrhea in women, cold bones and brain, Qi/Blood deficiency, nausea/vomiting, chronic or acute diarrhea. Treatment lies in warming and tonifying, avoiding rigid/drying agents. Nourish Blood and Qi, perhaps assisting with Ginger (*Shengjiang*) and Cinnamon Twig (*Guizhi*). As ancients said: "Deficiency of Essence requires tonification with flavor." Clinging to rigid/drying agents to quickly restore Yang risks depleting Kidney Water and allowing Heart Fire to blaze alone. Excess leads to harm; control restores balance. *Neijing* says: "Excess Yin causes excessive sweating and cold body." *Yin Yang Ying Xiang Da Lun* says: "Yin excess causes cold body, sweating, shivering, and Jue." *Tiao Jing Pian* says: "Yin excess generates internal cold." Qibo said: "Rebellious Qi rises, cold accumulates in chest, cannot be purged as purging removes warmth, leaving only cold, causing 'Han Zhong'." Li Dongyuan explained: "This is Spleen/Stomach insufficiency, physical labor impairing Middle Jiao transport, transmitting to Han Zhong. Tonify Yang using *Fuzi Lizhong Tang* powder, mixed with clear broth from mutton boiled with scallions. Several doses cure it." Predecessors' theories are detailed. Physicians who explore their meaning and follow classics in prescribing will avoid premature death.