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Heaven and Earth are the greatest of forms; Yin and Yang are the greatest of Qi (vital energy). Only when form and Qi mutually support each other can they be established, never being neglected or abandoned. (Tai Gong Diao in *Zhuangzi: Ze Yang* said: Heaven and Earth are the greatest of forms; Yin and Yang are the greatest of Qi. The Dao serves as their common source. Qi is carried by form, and form is filled by Qi. Since Qi and form wait for and depend on each other, it is said that they are established through mutual support, never being neglected.) When male and female combine their essence, all things are transformed and born, containing the form and Qi of Heaven and Earth's Yin and Yang. (*Xici* states: Heaven and Earth interact, causing all things to mature richly; male and female combine essence, causing all things to be born.) Regarding the numbers seven and eight: Seven is Shaoyang (Lesser Yang); Eight is Shao Yin (Lesser Yin), interacting and flowing. Thus, at fourteen years old (2x7), Tian Gui (substance promoting reproductive maturity) arrives in women; at sixteen years old (2x8), Tian Gui arrives in men, marking the beginning of conception due to the union of Yin and Yang. (Qibo stated: At fourteen, a woman's Tian Gui arrives, her Ren Mai (Conception Vessel) becomes unobstructed, and Chong Mai (Penetrating Vessel) flourishes, allowing menstruation to occur regularly and enabling pregnancy. At sixteen, a man's Kidney Qi flourishes, his Tian Gui arrives, essence overflows, Yin and Yang harmonize, enabling him to have children. Texts state: A woman has the capacity for motherhood at fourteen and ceases reproductive function at forty-nine; a man has the capacity for fatherhood at sixteen and ceases Yang transformation at sixty-four.) Regarding the numbers nine and ten: Nine is Laoyang (Old Yang); Ten is Lao Yin (Old Yin), enveloping each other to bestow form. Thus, Yin reaches its limit at ten, which men can encircle; Yang reaches its limit at nine, which women can square. This is because Yin and Yang generate each other to complete the cycle. (*Zishuo*: Yin limits at ten, encircled by men; Yang limits at nine, squared by women. Nine involves change, so women squaring it is insufficient; Ten involves no change, so men enclosing it is sufficient. Explanation: Men have households, enclosing Yin externally; Women have chambers, squaring Yang internally. *I Ching* says: A woman remains correct and auspicious by following one until the end. The Master regulates rituals; following women brings misfortune. Roundness symbolizes enclosure, representing the Way of the Ruler and the Way of the Husband. Roundness allows for regulating rituals and practicing benevolence. Squareness represents the Way of the Minister and the Way of the Wife. Squareness implies following one path exclusively. Men follow enclosure and regulation, consistent with "Husband"; Women follow benevolence and submission, consistent with "Ren" (Benevolence)). Yuan Qi (Primordial Qi) nurturing the fetus begins at Zi (Rat hour/position). Counting from Zi, men rotate left for thirty years reaching Si (Snake position); women rotate right for twenty years reaching Si. Si is Zheng Yang (True Yang), where Yin solidifies and follows. From Si during pregnancy, men rotate left, born after ten months at Yin (Tiger position); women rotate right, born after ten months at Shen (Monkey position). Shen is Sanyin (Three Yin), Yin is Sanyang (Three Yang), revealing the timing of reproduction. Their innate endowments vary! Bodies differ in rigidity and flexibility, pulses in strength and weakness, Qi in abundance and scarcity, Blood in flourishing and decline, all fixed and unchangeable. (*Nanjing Chapter 19* states: Men are born at Yin, Yin belongs to Wood, which is Yang; Women are born at Shen, Shen belongs to Metal, which is Yin. Yang's commentary notes: Yuan Qi originates at Zi, the root of human life. Men move left from Zi for thirty years; women move right from Zi for twenty years, both reaching Si for marriage and pregnancy. In ancient times, men married at thirty and women at twenty, following this law. Ten months after Si, boys are born moving left to Yin, so men's age cycles start at Bingyin. Girls move right from Si to Shen for ten months, so women's age cycles start at Renshen.) As for different regions, the proportion of births varies appropriately; auspicious events bring omens, and dreams correspond to categories. Thus, Jingzhou and Yangzhou with thin soil produce more daughters; Yongzhou and Jizhou with fertile soil produce more sons. Bears and black bears are omens for boys, vipers and snakes are omens for girls, all deducible by reason. (*Zhou Li - Zhifang Shi*: People of Yangzhou: two men, five women; Jingzhou: one man, two women; Yongzhou: three men, two women; Jizhou: five men, three women. *Shi Jing - Si Gan*: What are auspicious dreams? Dreams of bears and black bears, vipers and snakes. The elder divines: Bears and black bears are omens for boys; vipers and snakes are omens for girls.) Among fetal transformation methods, there is "turning a female fetus into a male," also natural law. For example, eating rooster meat takes the complete Yang essence from animal products; wearing Realgar takes the complete Yang essence from mineral products. (*Qianjin Fang* method for turning female to male uses Danshen Wan, utilizing the head of a rooster from the east gate. Another method uses one liang of Realgar sewn into a pouch to wear. *Bencao*: Dan Xiong Ji (Red Rooster) tonifies deficiency and warms the middle, unblocks spirit and detoxifies; its liver tonifies Kidneys; its comb blood benefits Yang. Wearing Realgar keeps ghosts and demons away and prevents injury from toxic creatures.) Holding bows and arrows, wielding axes, utilizes rigid objects in human affairs. Qi types connect secretly, Creation shifts subtly, definitely before the third month when the fetus takes shape. Because the fetal form is not yet established, Yang can overcome Yin, changing female to male, which is naturally so. (Chao Yuanfang discussed: In the third month of pregnancy, the fetal form begins, shapes begin to transform, lacking fixed appearance, changing upon seeing things. To desire a boy, hold bows and arrows, shoot roosters.)