岐伯《明堂经》云∶以八寸为一尺，以八分为一寸，缘人有长短肥瘦不同，取穴不准。
扁鹊《明堂》云∶取男左女右，手中指第二节为一寸，为缘人有身长手短，身短手长，取穴
不准。孙思邈《明堂》云∶取患人男左女右，手大拇指节横纹为一寸，以意消详，巧拙在人
，亦有差互。今取男左女右，手中指第二节，内度两横纹，相去为一寸。自根据此寸法，与人
着灸，疗病已来，其病多得获愈，此法有准，今以为定。
凡灸头与四肢，皆不令多灸，缘人身有三百六十五络，皆归于头，头者诸阳之会也，若
灸多，令人头旋目眩，远视不明，缘头与四肢肌肉薄，若并灸则气血滞绝于注下，宜歇火气
少时，令气血遂通，再使火气流行，候炷数足，自然除病，宜详察之。
凡点灸时，须要身体平直，四肢勿令拳缩，坐点勿令俯仰，立点勿令倾侧。灸时孔穴不
正，无益于事，徒烧好肉，虚忍痛楚之苦。有病先灸于上，后灸于下，先灸于少，后灸于多
，宜详审之。
凡着灸疗病，历春夏秋冬不较者，灸炷虽然数足，得疮发脓坏，所患即瘥。如不得疮发
脓坏，其疾不愈。《甲乙经》云∶灸疮不发者，故履底灸，今热熨之，三日即发脓出，自然
愈疾。今用赤皮葱三五茎，去其葱青，于糖灰中煨熟，拍破，热熨灸疮十余遍，其疮三日自
发立坏脓出，疾愈。
Qibo in the *Mingtang Jing* (Classic of the Bright Hall) stated: Use eight cun as one chi, and eight fen as one cun. This is because people vary in height and body shape; without a standardized measurement, acupoint selection would be inaccurate.
Bianque in the *Mingtang* stated: For men, use the left hand; for women, use the right hand. The length of the second segment of the middle finger is taken as one cun. This accounts for variations where some have long bodies but short hands, or short bodies but long hands; otherwise, acupoint selection would be inaccurate.
Sun Simiao in the *Mingtang* stated: For male patients, use the left hand; for female patients, use the right hand. The transverse crease of the first segment of the thumb is taken as one cun. One must judge flexibly based on circumstances; skill varies from person to person, leading to potential discrepancies.
Currently, we adopt the method of taking the distance between the two transverse creases within the second segment of the middle finger of the left hand for men and the right hand for women as one cun. Since adopting this measurement standard for moxibustion treatment, most diseases have been cured. This method is reliable and is now established as the fixed standard.
When applying moxibustion to the head and four limbs, excessive moxibustion should be avoided. The human body has 365 collaterals that all converge at the head, which is the meeting point of all Yang meridians. Excessive moxibustion on the head can cause dizziness, vertigo, and blurred vision. Because the muscles of the head and limbs are thin, simultaneous extensive moxibustion may cause Qi and Blood stagnation, preventing them from flowing downward. It is advisable to pause the application of heat for a while to allow Qi and Blood to circulate freely, then resume until the required number of moxa cones is completed. Illness will naturally be expelled. This requires careful observation.
When marking acupoints for moxibustion, the body must remain straight, and the four limbs should not be curled. When sitting, avoid leaning forward or backward; when standing, avoid tilting. If the acupoints are not accurately located, the treatment will be ineffective, resulting only in burning healthy tissue and causing unnecessary pain. In treating illness, apply moxibustion to the upper parts first, then the lower parts; apply to fewer points first, then more points. This requires careful deliberation.
In moxibustion therapy, regardless of the season (spring, summer, autumn, or winter), if the number of moxa cones is sufficient and the moxa sore develops pus and ulcerates, the disease will heal. If the moxa sore does not develop pus and ulcerate, the disease will not resolve. The *Jia Yi Jing* (Classics of Acupuncture and Moxibustion) states: If the moxa sore does not erupt, one may use the "shoe sole moxibustion" method. Currently, using hot compresses, pus will emerge after three days, and the disease will naturally heal. Now, take three to five stalks of red-skin green onion, remove the green tops, roast them in sugar ash until cooked, crush them, and apply as a hot compress to the moxa sore for over ten times. The sore will naturally erupt, ulcerate, and discharge pus within three days, leading to recovery.