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The Four Seasons refer to Spring, Summer, Autumn, and Winter, which constitute the sequence of climatic change in a year. The processes of growth, maturation, harvest, and storage cycle endlessly, generating life infinitely; this is the manifest and proximate Qi (vital energy) of Heaven. Since Qi has both pure/harmonious and excessive/deficient aspects, it inevitably leads to imbalance. Humans exist within the intersection of Heaven and Earth's Qi; we grow and develop by receiving the harmonious Qi of Heaven and Earth, but fall ill when exposed to the hostile Qi (adverse pathogenic factors) of Heaven and Earth.

During the late summer, the mixture of Summerheat (Shu) and Dampness easily damages Yuan Qi (Original Energy) and consumes Body Fluids. Dampness is a turbid pathogen that most easily injures Yang Qi. When the weather is hot and the earth steams, the body's Qi also disperses outward, causing the Cou Li (pores and skin texture) to open and sweat to profusely escape. Consequently, the Spleen and Stomach become weak due to this loss. Under such conditions, the external environment's intense humid heat is easily invaded, leading to disease depending on the excess or deficiency of Yin and Yang in the body. For instance, running long distances under the scorching sun causes Zhong Shu (Heatstroke); mild cases are treated with Liu Yi San, while severe cases require Bai Hu Tang. If one seeks coolness due to fear of heat, allowing Summerheat to be trapped by Wind, Xiang Ru Yin should be modified for treatment. Alternatively, residing in cool pavilions or water towers and consuming too many melons, fruits, or cold foods can suppress the internal deficient Yang, a condition known as Cold-Heat injuring Yang, which requires immediate treatment with Acrid-Warm formulas such as Da Shun San or Leng Xiang Yin Zi. If only excessive consumption of raw/cold foods occurs, Suo Pi Yin or Zheng Qi San may be used appropriately. If a person has constitutionally deficient Yuan Qi and slightly contracts external Summerheat, treatment focuses on formulas like Sheng Mai San, Qing Shu Yi Qi Tang, or Xiao Shu Wan to awaken Spleen Yang and dispel Damp-Heat.

Regarding winter, the severe cold and killing Qi cause Shang Han (Cold Damage), which Zhang Zhongjing detailed extensively. However, if Yang Qi remains hidden internally while the weather is clear and dry with little rain or snow, Dong Wen (Winter Warmth) syndrome forms. This requires large doses of Clearing and Purging methods; one must not rigidly adhere to the established methods of *Shang Han Lun* to avoid harming patients. In recent times, such diseases are common and require careful examination. Mild cases use Xing Su Yin; severe cases use Cong Chi Tang added with Jing Jie, Bo He, Zhi Ke, Jie Geng, Lian Qiao, and Da Bei Mu to release the exterior.

If it is early spring, severe cold is retreating, and Wood/Wind Qi takes control. Its nature is ascending and close to Dryness, often attacking the Upper Jiao. Thus, symptoms such as fever, cough, and slight aversion to wind are common. Huang Qin Tang serves as the main formula, modified according to symptoms: adding Bo He, Jie Geng, Jing Jie, Fang Feng, Xing Ren, Su Ye, Lian Qiao, Bei Mu, Sang Ye, Ju Hua, Niu Bang Zi, Chan Tui, etc., utilizing light and clear flavors to purify and calm the Lung and Wei Qi. If untreated and prolonged, the pathogen gradually enters the Ying (Nutritive) level, showing signs of reverse transmission or forward transmission. Many modern city physicians do not understand this, blindly adhering to Zhang Zhongjing’s Six Channels methods, indiscriminately administering Acrid-Warm diaphoretics. This depletes fluids and injures Yin, potentially leading to coma, stertorous breathing, Jue Ni (cold extremities), blurred vision, severe cough with hemoptysis progressing to Lao Zhai (consumption), or fullness in the Stomach requiring purgation but neglected, resulting in delirium, mania, spasms, and convulsions, from which many cannot be saved. Another scenario is extreme heat with peripheral flow, termed forward transmission to the Stomach Fu organs, requiring urgent purgation to preserve Yin fluids, indicated by a yellow, dry, cracked tongue coating. Unfortunately, many ignorant quacks fail to recognize this. Out of compassion to save the world, I studied day and night, realizing the causes of these diseases and methods of rescue. Having verified their efficacy repeatedly, I recorded them to alleviate the suffering of the people.

Alas! From ancient times to the present, no one has elucidated the profound mysteries of Chun Wen (Spring Warmth), Shi Wen (Damp Warmth), and Dong Wen (Winter Warmth). Consequently, countless individuals have been misled by vulgar practitioners. Perhaps earlier sages understood the rationale but treasured it like jade, failing to write it down, leading to its eventual obscurity; or perhaps books existed but were lost over time. Furthermore, some misinterpret classical texts, such as "Injured by Dampness in Autumn, Cough arises in Winter." Careful study reveals that "Dampness" here is likely a transcription error.历代 commentators followed the text without correcting this error, further confusing matters by citing "Late Summer Summerheat-Dampness." They fail to realize that early autumn follows late summer; if Summerheat-Dampness latent pathogen prevails, clearing Summerheat and drying Dampness methods remain applicable. However, during the transition between Summer and Autumn, changes are frequent. By deep autumn, Dryness commands prevail, often peaking in late autumn and early winter. Humans, situated in the Qi intersection, suffer from this hostile Qi, which lies latent and unexpressed, constituting Qiu Zao (Autumn Dryness). Symptoms include cough, fever, chest tightness, and even critical signs like delirium, mania, spasms, and syncope. Treatment must assess the climate's coolness or warmth, distinguishing between Cold-Dryness and Heat-Dryness therapies, using moistening-warm or sweet-cold herbs with modifications. One must also examine the tongue coating; if it is scorched yellow, dry, and cracked, with thirst and ability to drink, large doses of clearing and purging agents like San Huang Cheng Qi Tang are necessary. This is a "pulling firewood from under the pot" strategy. Do not fear purgation and retain pathogens, leading to prolonged illness where extreme excess presents as weakness. Misusing warming tonics can lead to fatal errors. For the sake of benefiting others and saving the desperate, I publicly share these verified insights so future generations may benefit from guidance.

Lan notes: Among the Four Seasons, Summerheat-Dampness is the most prevalent. Previously, conditions like Feng Wen (Wind Warmth), Qiu Zao, and Dong Wen were conflated with Shang Han, and practitioners rigidly adhered to days of meridian transmission, mistakenly using Acrid-Warm diaphoretics. Since Mr. [the author] clarified that Wind nature ascends and approaches Dryness, initially attacking the Upper Jiao, and advocated light lung-clearing formulas, while reiterating the concept of Autumn Dryness to distinguish orthodox scriptural intent, he has greatly benefited future learners. His principles are profound and clear. The world only knows the phrase "Warm pathogens enter from above," attributing its explanation solely to Ye Tianshi, unaware that this was stated before Ye. Perhaps Ye based his elucidation on this book and propagated it, which is possible. As the proverb goes, "Latercomers surpass predecessors." This seems to be the case.