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[Ping An]: This volume, from the beginning of the scroll to above the center below both eyes, was originally damaged and lost in the manuscript. I (Yang Shangshan) retrieved it from thirteen pages of the imperial damaged scrolls at the Ninna-ji Palace in Japan. By verifying with the "Gu Kong Lun" chapter of *Su Wen*, the "Gu Kong" chapter of this book, and the "Qi Jing Ba Mai" chapter of *Jia Yi Jing*, I supplemented the text after the character "Yang" in the scripture and Yang's commentary stating that the Du Meridian originates above the lower abdomen, thus restoring the missing parts. However, Yang's commentary in this chapter is too eroded to be supplemented, which is regrettable. I strictly preserved the truth by counting characters and leaving spaces according to the missing parts. From the character "Yang" in the scripture onwards, it can be seen in Volume 16, Chapter 60 "Gu Kong Lun" of *Su Wen*, as well as in Volume 2, Chapter 2 of *Jia Yi Jing* and the "Gu Kong" chapter of this book.

Qibo said: The Du Meridian (the Governor Vessel, governing all Yang meridians) originates from the central bone below the lower abdomen. In women, it enters and connects to the Ting Kong (opening for urine), which is the end of the urethral opening. (This meridian originates from the lower abdomen, follows the external genitalia, ascends to the inner canthus of the eye, then goes up to the forehead, crosses the vertex, enters the brain, emerges again, descends separately to the nape, runs along the spine, enters the paraspinal muscles, and connects with the Kidney. Then it branches from the Kidney, ascends, and returns to the Kidney. *Jiu Juan* branches from the Chumen gate, goes up the forehead along the vertex, down the nape and spine into [missing], connects with the external genitalia, enters the umbilicus, and ascends to the clavicular fossa. Comparing these two meridians, the reversal of the Du Meridian is obvious. Furthermore, checking ancient editions, this part seems to refer to the Ren Meridian, but there is confusion; thus, the Du [missing]... *Nan Jing* states: It originates from the Shu point of Xia Ji, ascends along the spine to Fengfu, gathering all Yang meridians. The meaning is also consistent. Ting Kong refers to the end hole of the urethra. Ping An notes: The character "Yu" in "originates from the lower abdomen" is absent in the "Gu Kong" chapter of this book. *Su Wen* has the character "Ye" after "Duan".) Its collateral network follows the external genitalia, meets at the Cu Jian (perineum), and circles behind the Cu Hou (posterior perineum). (The collateral network of the Du Meridian exits the Ting Kong, branches left and right, follows the external genitalia of men and women, meets at the Cu Jian, and circles behind the Cu Hou. "Cu" sounds like "Du", this [missing] behind. Ping An notes: "Cu" is written as "Zuan" in *Jia Yi Jing* and also as "Zuan" in the "Gu Kong" chapter of this book, pronounced "Du", meaning unclear. Checking annotations on "Gu Kong Lun": "Cu" means the intersection, referring to where the two excretory passages meet, between the anterior and posterior orifices. *Jin Jian* states: "Cu" is the concave point below the pubic bone, where the front of the two thighs meet and knot together, between the anterior and posterior orifices. Therefore, "Cu" should be written as "Zuan" meaning union, based on *Jia Yi Jing* and the "Gu Kong" chapter of this book. *Shuo Wen* describes "Zuan" as resembling a red silk braid. There is a seam between the two orifices, shaped like a braid, hence called "Zuan". Japanese physician Danbo Yuanjian already held this view, which seems more appropriate than "Cu" meaning usurpation, so I adopted it for reference. Also, I tentatively filled the three missing characters here as "Liang Yin Qian" [front of the two yins].) Branching off to circle the buttocks, it reaches the collaterals of the Shaoyin and Juyang (Taiyang) meridians, merges with the Shaoyin, ascends along the medial posterior aspect of the thigh, penetrates the spine, and attaches to the Kidney. (From behind the Cu Hou, it branches into two sides, circles the buttocks, reaches the collaterals of Foot Shaoyin and Foot Taiyang, merges with Shaoyin, travels along the thigh, penetrates the spine, and attaches to the Kidney.) It meets the Taiyang meridian originating at the inner canthus of the eye. (Ascending from the Kidney with Foot Taiyang, it originates at the inner canthus of the eye.) It goes up the forehead, crosses the vertex, enters and connects with the brain, emerges again, descends separately to the nape, follows the interior of the shoulder blades, runs alongside the spine to the middle of the waist, enters the paraspinal muscles, connects with the Kidney, and stops. In men, it follows the penis down to the Cu Jian, same as in women. (The Du Meridian and Taiyang both ascend to the inner canthus, cross at the vertex, enter the brain, emerge, branch into two sides descending to the nape, then follow the interior of the left and right shoulder blades, run alongside the spine to the waist, follow the paraspinal muscles, and connect with both Kidneys before stopping. This is the same for men and women. Traditionally, it was believed that the Du Meridian is only one vessel running exactly in the midline of the spine, which is incorrect. Ping An notes: "Dian" is written as "Dian" in *Su Wen* and *Jia Yi Jing*. *Jia Yi Jing* writes "Bo". *Su Wen* lacks the words "er zhi" [and stops]. Also, *Ba Mai Kao* states: "The Du Meridian also branches from the brain down to the nape, follows the scapula, meets Hand and Foot Taiyang and Shaoyang at Dazhu, located in the depression 1.5 cun lateral to the spine below the first thoracic vertebra, internally running alongside the spine to the middle of the waist, entering the paraspinal muscles to connect with the Kidney." This proves that the note describing branching into two sides following the left and right shoulder blades is correct, and the old tradition of it being a single midline vessel is wrong.) The part rising straight from the lower abdomen passes through the center of the Qi (Umbilicus), ascends through the Heart, enters the throat, goes up to the chin, circles the lips, and connects to the center below both eyes. (The Du Meridian originates from below the lower abdomen up to the forehead; ascending from the lower abdomen to the Kidney, it returns to the Kidney and stops. This part rises straight from the lower abdomen to below both eyes. Passing through Qi, penetrating the Heart, entering the throat, and going up to the chin are all one path. Above the circling of the lips, it becomes two paths again, each directly below the pupils, hence called "Center". Ping An notes: "Shaofu" is written as "Xiaofu" in *Jia Yi Jing*. "Qi Zhongyang" is written as "Qizhong Zhongyang" in *Jia Yi Jing*. "Liangmu zhi xia zhongyang" is written as "Liangmu zhi zhong" in *Jia Yi Jing*.) Diseases arising from this include pain rushing up from the lower abdomen to the heart, inability to pass stool and urine, known as Chong Hernia. (Pain rushing up from the lower abdomen to the heart. Disease of the meridians controlling anterior and posterior orifices, inability to pass stool and urine, is the Chong Hernia disease.) In women, it causes infertility, strangury, hemorrhoids, enuresis, and dryness of the pharynx. When the Du Meridian is diseased, treat the Du Meridian. (Infertility refers to the inability of mother and child to be born. Strangury, hemorrhoids, and enuresis occur because the meridian ascends from the external genitalia to the throat, causing these diseases. The paths of the Ren Meridian and Bo Mai are similar, so they must be distinguished carefully. When the Du Meridian is diseased, treat the Du Meridian, do not treat the Ren Meridian. Some editions lack the character "Zhi". Ping An notes: "Bu Zi" is written as "Bu Yun" [infertility] in both *Su Wen* and *Jia Yi Jing*. Also, Wang's annotation in *Su Wen* states that the Chong, Ren, and Du meridians have different names but the same body. The annotation in *Jia Yi Jing* says: What *Su Wen* calls the Du Meridian seems to refer to the Ren and Chong. Having heard much but remaining uncertain, I recorded them together for future scholars.)