六经所以分手足阴阳者，以足为本，手为标。如足厥阴风木肝，与足少阳相火胆为表里
，同在一处；足太阴湿土脾，与足阳明燥金胃；足少阴君火肾，与足太阳寒水膀胱，皆相附
近。至于手三阴三阳，相去颇远。盖足阴阳本乎地，奠方有常；手阴阳法乎天，变化无定。
足为常度，手为揆度，体常尽变，故为奇度，奇常揆度，其道一也。足厥阴肝脉，在左关上
，弦细而长；足少阴肾脉，在左尺中，沉濡而滑；足太阴脾脉，在右关上，沉软而缓；足少
阳胆脉，在左关上，弦大而浮；足阳明胃脉，在右关上，浮长而涩；足太阳膀胱脉，在左尺
中，洪滑而长；手厥阴心主包络，在右尺中，沉弦而数；手少阴心脉，在左寸口，洪而微实
；手太阴肺脉，在右寸口，涩短而浮；手少阳三焦脉，在右尺中，洪散而急；手阳明大肠脉
，在右寸口，浮短而滑；手太阳小肠脉，在左寸口，洪大而紧。此手足阴阳六经脉体。及其
消息盈虚，则化理不住；运动密移，与天地参同。彼春之暖，为夏之暑；彼秋之忿，为冬之
怒；四变之动，脉与之应者，乃气候之至脉也。故要论云∶厥阴之至其脉弦(一云沉短而数)
，少阴之至其脉钩(一云紧细而微)，太阴之至其脉沉(一云紧大而长)，少阳之至大而浮(一
云乍疏乍数乍短乍长)，阳明之至短而涩(一云浮大而短)，太阳之至大而长。本脉至脉，虽
识体状，又须推寻六气交变，南政北政，司天在泉，少阴之脉，应与不应。如要论所诠，乙
庚丙辛丁壬戊癸金水木火四运者，皆曰北政。少阴在泉，故寸不应。甲己土运，德流四政，
譬如巡狩而居南面北，谓之南政。少阴在天，故寸亦不应。若北政厥阴在泉，则右不应；太
阴在泉，则左不应。若南政厥阴司天，则右不应；太阴司天，则左不应。诸不应者，反其诊
则见矣，此乃常度。合不应而响应，是谓太过；应而不应，是谓不及，皆为外淫所因。所以
欲知少阴应否者，以君火为万物资始，不可不知。此且以一岁而论之，若细推寻，当以日论
，精微之道，不可不知。若岁主脏害，自当揆度平治，不能反隅，则不复也。
六经之所以区分手经和足经的阴阳，是因为以足经为本源，手经为标末。例如足厥阴风木肝与足少阳相火胆互为表里，处于同一位置；足太阴湿土脾与足阳明燥金胃；足少阴君火肾与足太阳寒水膀胱，都相互邻近。至于手三阴和手三阳经，彼此距离颇远。大概足部阴阳经脉根源于地，方位固定不变；手部阴阳经脉效法于天，变化没有定规。足经是常规标准，手经是衡量尺度，本体恒定而穷尽变化，所以称为奇度，奇常与衡量尺度，其道理是一致的。足厥阴肝脉，位于左关部，脉象弦细而长；足少阴肾脉，位于左尺部，脉象沉濡而滑；足太阴脾脉，位于右关部，脉象沉软而缓；足少阳胆脉，位于左关部，脉象弦大而浮；足阳明胃脉，位于右关部，脉象浮长而涩；足太阳膀胱脉，位于左尺部，脉象洪滑而长；手厥阴心主包络，位于右尺部，脉象沉弦而数；手少阴心脉，位于左寸口，脉象洪而微实；手太阴肺脉，位于右寸口，脉象涩短而浮；手少阳三焦脉，位于右尺部，脉象洪散而急；手阳明大肠脉，位于右寸口，脉象浮短而滑；手太阳小肠脉，位于左寸口，脉象洪大而紧。这就是手足阴阳六经的脉象本体。等到脉气的消长盈亏，则化生之理不停止；运动紧密转移，与天地参同。那春天的温暖，成为夏天的暑热；那秋天的肃杀，成为冬天的严寒；四季变化的动态，脉象与之相应，这是气候到来时的脉象。所以《要论》说：厥阴之气至时，其脉弦（另一说法是沉短而数）；少阴之气至时，其脉钩（另一说法是紧细而微）；太阴之气至时，其脉沉（另一说法是紧大而长）；少阳之气至时，脉大而浮（另一说法是忽疏忽数忽短忽长）；阳明之气至时，脉短而涩（另一说法是浮大而短）；太阳之气至时，脉大而长。本脉与至脉，虽然认识了体状，又必须推寻六气交变，南政北政，司天在泉，少阴之脉，应当出现还是不应当出现。如《要论》所阐述，乙庚丙辛丁壬戊癸金水木火四运者，都称为北政。少阴在泉位，所以寸口脉不应；甲己土运，德流四政，譬如巡狩而居南面北，称为南政。少阴在天位，所以寸口脉也不应。如果北政时厥阴在泉，则右寸不应；太阴在泉，则左寸不应。如果南政时厥阴司天，则右寸不应；太阴司天，则左寸不应。所有不应出现的脉象，反过来诊察就能见到了，这是常规尺度。合该不应却响应了，这叫太过；合该响应却不响应，叫不及，都是被外邪侵袭所致。所以想要知道少阴脉是否应当出现，是因为君火是万物资始的根本，不可不知。这里暂且按一年来说，如果仔细推寻，应当按日推算，精微的道理，不可不知。如果岁主脏害，自然应当衡量平治，不能举一反三，就不再赘述了。
The reason why the Six Channels (Liu Jing) are distinguished into Hand and Foot Yin-Yang is that the Foot channels serve as the root, while the Hand channels serve as the branch. For instance, the Foot Jueyin Wind-Wood Liver channel and the Foot Shaoyang Ministerial-Fire Gallbladder channel are interior-exteriorly related and located in the same region; the Foot Taiyin Damp-Earth Spleen channel and the Foot Yangming Dry-Metal Stomach channel; the Foot Shaoyin Sovereign-Fire Kidney channel and the Foot Taiyang Cold-Water Bladder channel, all are closely adjacent. As for the Three Yin and Three Yang Hand channels, they are quite distant from one another. Generally, the Foot Yin-Yang channels originate from the Earth, with fixed positions; the Hand Yin-Yang channels emulate the Heaven, undergoing constant changes. The Foot channels represent the standard measure, while the Hand channels represent the gauge of variation. The body remains constant while exhausting change, thus termed "Qi Du" (Extraordinary Measure). The principles of Qi Du and Chang Du (Standard Measure) are identical.
The Foot Jueyin Liver pulse is located at the Guan position on the left side, presenting as Xian (Wiry), fine, and long; the Foot Shaoyin Kidney pulse is located at the Chi position on the left side, presenting as Chen (Deep), Ru (Soggy), and Hua (Slippery); the Foot Taiyin Spleen pulse is located at the Guan position on the right side, presenting as Chen (Deep), Ruan (Soft), and Huan (Moderate); the Foot Shaoyang Gallbladder pulse is located at the Guan position on the left side, presenting as Xian (Wiry), large, and Fu (Floating); the Foot Yangming Stomach pulse is located at the Guan position on the right side, presenting as Fu (Floating), Chang (Long), and Se (Choppy); the Foot Taiyang Bladder pulse is located at the Chi position on the left side, presenting as Hong (Surging), Hua (Slippery), and Chang (Long); the Hand Jueyin Pericardium pulse is located at the Chi position on the right side, presenting as Chen (Deep), Xian (Wiry), and Shu (Rapid); the Hand Shaoyin Heart pulse is located at the Cun position on the left side, presenting as Hong (Surging) and slightly Shi (Excess); the Hand Taiyin Lung pulse is located at the Cun position on the right side, presenting as Se (Choppy), Duan (Short), and Fu (Floating); the Hand Shaoyang Sanjiao pulse is located at the Chi position on the right side, presenting as Hong (Surging), San (Scattered), and Ji (Urgent); the Hand Yangming Large Intestine pulse is located at the Cun position on the right side, presenting as Fu (Floating), Duan (Short), and Hua (Slippery); the Hand Taiyang Small Intestine pulse is located at the Cun position on the left side, presenting as Hong (Surging), Da (Large), and Jin (Tight). These constitute the pulse bodies of the Six Channels of Hand and Foot Yin-Yang. Regarding their waxing and waning, the principles of transformation do not cease; their movement and subtle shifts correspond to Heaven and Earth. The warmth of spring becomes the heat of summer; the severity of autumn becomes the cold of winter; the dynamics of the four seasonal changes respond in the pulses, which are known as the pulses of climatic arrival. Thus, the *Yao Lun* states: When Jueyin arrives, its pulse is Xian (Wiry) [another version says Chen (Deep), Duan (Short), and Shu (Rapid)]; when Shaoyin arrives, its pulse is Gou (Hooked) [another version says Jin (Tight), Xi (Fine), and Wei (Micro)]; when Taiyin arrives, its pulse is Chen (Deep) [another version says Jin (Tight), Da (Large), and Chang (Long)]; when Shaoyang arrives, the pulse is Da (Large) and Fu (Floating) [another version says occasionally Shu (Sparse), occasionally Shu (Rapid), occasionally Duan (Short), occasionally Chang (Long)]; when Yangming arrives, the pulse is Duan (Short) and Se (Choppy) [another version says Fu (Floating), Da (Large), and Duan (Short)]; when Taiyang arrives, the pulse is Da (Large) and Chang (Long). Although the original and arriving pulses reveal their forms, one must further deduce the interaction and transformation of the Six Qi, Nan Zheng (Southern Administration) and Bei Zheng (Northern Administration), Si Tian (Governing Heaven) and Zai Quan (Presiding Earth), and whether the Shaoyin pulse should appear or not. As explained in the *Yao Lun*, those governed by Yi-Geng, Bing-Xin, Ding-Ren, Wu-Gui (Metal, Water, Wood, Fire transformations) are called Bei Zheng (Northern Administration). With Shaoyin in the Zai Quan position, the Cun position does not respond. Those governed by Jia-Ji (Earth transformation), where virtue flows through the four administrations, akin to a patrol residing facing South and North, are called Nan Zheng (Southern Administration). With Shaoyin in the Si Tian position, the Cun position also does not respond. If in Bei Zheng, Jueyin is in Zai Quan, then the Right Cun does not respond; if Taiyin is in Zai Quan, then the Left Cun does not respond. If in Nan Zheng, Jueyin is in Si Tian, then the Right Cun does not respond; if Taiyin is in Si Tian, then the Left Cun does not respond. In cases of non-response, reversing the diagnostic method reveals the truth; this is the standard measure. Responding when one should not is called "Tai Guo" (Excess); responding when one should not is called "Bu Ji" (Deficiency); both are caused by external pathogenic influences. Therefore, to know whether the Shaoyin pulse should respond, one must understand that Sovereign Fire is the beginning of all things' sustenance. This discussion applies to a year; if deduced meticulously, it should be applied to days. The subtle principles cannot be ignored. If the yearly master harms the Zang organs, one must naturally gauge and treat them. If one cannot infer from one case, no further explanation will be given.