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The human body has twelve meridians, with Qi and Blood, Yin and Yang distinctly distributed. Why is it that when selecting acupoints according to meridians for variolation, only the Shaoyang Sanjiao Meridian (Triple Burner Meridian) points are selected? *Bei Yao* states: Shaoyang governs Qi; any medicine entering the Gallbladder Meridian's Qi aspect merges into the Sanjiao. Therefore, only three points on both arms are selected, aiming to coordinate with the Upper, Middle, and Lower Sanjiao. The rationale is most exquisite.

*Huangdi Neijing* says: The Upper Sanjiao is like mist or dew; it is the source of Qi. Selecting [Xiaoshuo] (likely referring to a specific point contextually linked here, possibly Cold Abyss/Lengyuan based on later text) coordinates with Tanzhong (CV17) in the upper region. The Middle Sanjiao is like fermentation; it is the source of Blood. Selecting Lengyuan (SI11) coordinates with the Epigastrium in the middle region. The Lower Sanjiao is like a ditch; it is the source of Water. Selecting Sidu (TE13) coordinates with Dantian (Elixir Field) in the lower region. Dantian is essentially Mingmen (Gate of Life). In summary, this does not depart from the principles of the Sanjiao. Thus, *Yijing* says: Looking up at the sky, the arrangement of stars is countless, but its essence lies in seven mansions as meridians and twenty-four luminaries as latitudes. Looking down at the earth, the flow and elevation of mountains and rivers are also countless, but its core lies in Five Sacred Mountains as masters and Four Great Rivers as tributaries. If Heaven and Earth are thus, how much more so the human body? Carefully examining this method reveals it to be very sound, with undeniable logic. It is indeed an excellent prescription ensuring absolute safety. I need not add further words.

Below the fourteenth thoracic vertebra on the back is Mingmen, an acupoint of the Du Mai (Governing Vessel). Anteriorly opposite the navel, the Dantian below the navel is the Front-Mu point of the Sanjiao, forming an interior-exterior relationship with Mingmen. Mingmen is the gate of generating Qi. Qi emerges to govern the area around the navel, dividing downward into three branches, rushing upward past the navel, passing Tianshu (ST25), reaching up to Tanzhong between the two breasts, where Yuan Qi (Primal Qi) is anchored. The Sanjiao has the function of a Zang organ but lacks the form of a Fu organ. The Upper Sanjiao is located at the upper opening of the stomach, governed at Tanzhong. The Middle Sanjiao is located at the stomach tube, governed beside the navel. The Lower Sanjiao is located below the navel at the upper opening of the Bladder, governed at the navel. The Sanjiao and Mingmen are originally connected by one Qi. Thus, *Jing* says: Yuan Qi is the envoy of the Sanjiao. Li Binhu said: The Sanjiao is the function of Mingmen. Wang Haicang said: The Sanjiao and Mingmen constitute one Fu, and their pulses can be diagnosed together. From this perspective, the Sanjiao and Mingmen rely on each other to function. Variolators therefore start with the Sanjiao points, initially using the Sanjiao to introduce the variola virus into Mingmen, and subsequently transmitting it from Mingmen back to the Sanjiao. The logic is accurate and appropriate, the method unique yet convenient. If the acupoints are accurately identified, it is ten thousand times safer than the "Steady Blowing Seed" method. Recorded by Tunanzi of Liling in the fourth month of summer, Dingyou year, 17th year of Daoguang reign of Qing Dynasty.

Note: The book claims that among ten thousand people inoculated, none suffered smallpox again, which is indeed not false talk. However, recently, occasionally one case out of a thousand has recurred. Proponents of the "Steady Blowing Seed" method slanderously claim this technique is unreliable. Parents of infants, although knowing cowpox vaccination is very convenient, dare not try it lightly. They do not realize that the occasional recurrence in one out of a thousand cases is not due to imprecise legislation/methodology, but rather poor execution. Recently, practitioners of cowpox have been careless and superficial; occasionally deviating slightly during puncture causes fetal toxins not to be fully expelled, and subsequent failure to re-introduce the vaccine leads to error. I have recently obtained a re-introduction method that is most secure. For children who have undergone initial inoculation, if months pass or until the next year, a second inoculation is performed. If pustules still form and scab over, further inoculation is required. Generally, after the formation of pus, if the puncture site shows a slight red disk after three days, and this red disk fades naturally after two or three more days, without rising to the top or forming pus, this proves that fetal toxins are exhausted. Thereafter, even if natural smallpox occurs, infection will never happen.