此灶中对釜月下黄土也。以灶有神。故迂隐其名耳。（贞白） 勿误用灶下土。其伏
龙肝是十年以来。灶额内火气积久自结。如赤色石。中黄。形貌八棱。取得研细。水飞用之
。（雷 ） 按二说不同。然如陶说者殊多。
味辛。气微温。主咳逆上气。吐血衄血。肠风尿血。泄精。及妇人崩带。妊娠时疫热病
令胎不安。催生下衣。又治小儿夜啼。大人中风不语。狂颠中恶。猝魇蛊毒。及诸疮痈肿毒
气。（调醋涂之） 有火土相生之妙。燥可去湿。故为止血之圣药。而治崩漏虚脱者。（阆风）
吐血久不止。伏龙肝二钱。米饮调下即止。下血。伏龙肝熟地白术附子阿胶黄芩各三两。灶
中黄土半斤。水煎服。女子血漏。伏龙肝半两。阿胶蚕沙炒各一两。为末。每空腹酒服二三
钱。以知为度。赤白带下。日久黄瘁。六脉微涩。伏龙肝棕榈灰梁上尘。各炒令烟尽。等分
为末。入龙脑麝香各少许。每服三钱。温酒或淡醋汤下。一年者半月可安。妊娠热病。伏龙
肝末一鸡子许。水调服之。仍以水和涂脐方寸。干又上。中风口噤不语。心烦恍惚。手足不
随。或腹中痛满。或绝而复苏。伏龙肝末五升。水八升。搅。澄清服。反胃吐食。灶中土年
久者为末。米饮服三钱。此方亦治胃虚者。小儿丹毒。多年灶下黄土末。和屋漏水敷之。新
汲水亦可。鸡子白或油亦可。干即易。 疮久烂。灶内黄土年久者研细。加黄柏黄丹赤石脂
轻粉
〔论〕 伏龙肝乃脾与肝之剂。盖取火土相生。以为各证之主治。在人身惟脾胃应之。
更为中土之主。以司其用者。不在风化之肝乎。第火土相生之义。如以为燥可去湿。犹止得
其肤而未悉其微也。夫脾胃固司湿土之化。而同干健之运。所以然者。有水中之真火。为之
母气也。如土不得水中之火。则湿土无以行其化。水即不得土为之主。而寒水亦无以行其化。
是水土合德以立地者。由是而两困也。致令一阴之为独使者。下失水之母气。中失土之用气。
不病于风之虚以为风眚。而还以侮所胜之土乎。（此本钱仲阳黄土治螈 之义而大畅之）故
必本火土相生之义。俾水土各奠其位。又必因水土合德之义。俾土木互相为用。乃全其中土
生育之化。是则黄土之用。非漫然去湿也。正欲用阳以化阴。而俾湿化得行也。湿化行而血
乃化。所以治血证者。非以止涩为功。盖补其生化之原。乃为固脱耳。推之女子崩带。男子
泄精胥效矣。亦非用其燥也。更欲化阴以和阳。而俾风化得平也。风化平而气乃和。所以疗
风证者。非以疏散为功。盖益其合化之原。乃为静风耳。推之狂颠蛊毒。中恶猝魇可愈矣。
或曰。补土多用燥湿之剂。如白术等味与兹种何别。而迥殊若是。曰。治血证多不用术者。
恐其燥阴而反剧耳。此味固用阳以化阴。非燥阴之剂也。先哲审处。夫岂苟然而已。
阴虚吐血者勿用。以其中有火气也。痈肿毒盛难消者。不得独用。（仲淳）
〔修治〕 水飞二次。令干。
这是灶台中铁锅下方的黄土。因为认为灶台有神灵，所以用委婉隐晦的名称来称呼它罢了。（陶弘景/贞白）不要误用普通的灶下土。所谓的伏龙肝，是十年来灶膛内火气长期积聚自然凝结而成的，像赤色的石头，中间呈黄色，形状为八棱柱状。取得后研成细粉，用水飞法处理使用。（雷敩）
按：这两种说法不同，但像陶弘景所说的那种情况非常多。
味道辛，气微温。主治咳嗽气逆、吐血、鼻出血、肠风便血、尿血、遗精，以及妇女崩漏带下。妊娠期间患时疫热病导致胎动不安者，可催生下衣（胎盘）。又治疗小儿夜啼、大人中风失语、癫狂中恶、突然受惊或蛊毒，以及各种疮痈肿毒之气。（可用醋调涂患处）具有火生土的奇妙功效，燥能去湿，所以是止血的圣药，尤其治疗崩漏虚脱。（阆风）
吐血久不止，用伏龙肝二钱，米汤调服即止。下血，用伏龙肝、熟地黄、白术、附子、阿胶、黄芩各三两，灶中黄土半斤，水煎服。女子血漏，用伏龙肝半两，阿胶、炒蚕沙各一两，研为末，每于空腹时用酒送服二三钱，以见效为度。赤白带下，日久面色萎黄，六脉微涩，用伏龙肝、棕榈灰、梁上尘，各炒至烟尽，等分为末，加入少许龙脑、麝香，每服三钱，温酒或淡醋汤送下。病程一年的，半月可安。妊娠热病，用伏龙肝末如鸡蛋大小，水调服，仍用水调和涂于方寸脐部，干了再涂。中风口噤不语，心烦恍惚，手足不能随意运动，或腹中痛满，或假死复苏，用伏龙肝末五升，水八升，搅拌，澄清后服用。反胃吐食，用年代久远的灶中土研为末，米汤送服三钱。此方也治疗胃虚者。小儿丹毒，用多年灶下黄土末，和屋漏水敷之，新汲水也可以，鸡蛋白或油也可以，干了就换。疮口久不愈合溃烂，用灶内年代久远的黄土研细，加黄柏、黄丹、赤石脂、轻粉。
[论述] 伏龙肝是调理脾与肝的药物，大概取用火生土的道理，作为各种病症的主治。在人体中只有脾胃应合于此，更是中土之主，而掌管其作用的，不就是风化之肝吗？只是火生土的意义，如果只认为是燥能去湿，还只停留在表面而未透彻其精微之处。脾胃固然主管湿土的运化，并参与天行健的运转，之所以如此，是因为有水中的真火作为母气。如果土得不到水中的火，那么湿土就无法进行运化；水如果得不到土作为主宰，寒水也无法进行运化。水土合德以确立地体，由此导致两者都困顿。致使一阴成为独使者，下失去水的母气，中失去土的用气，不因病于风虚而为风灾，反而去欺凌所胜的土吗？（这是阐发钱仲阳用黄土治疗抽搐的意义并加以发挥）所以必须基于火生土的意义，使水土各自安定其位；又必须依据水土合德的意义，使土木互相为用，才能保全中土生育的化育功能。这样看来，黄土的作用，不是漫然地去湿，正是想用阳气来化阴，而使湿气得行。湿气化行而血乃化，所以治疗血证，不是以收敛固涩为功效，而是补益其生化之源，这才是固脱的方法。推及女子崩带、男子泄精也都有效。这也不是单纯用其燥性，更想通过化阴来调和阳气，而使风化得以平复。风化平复而气乃和，所以治疗风证，不是以疏散为功效，而是增益其合化之源，这才是平息风邪的方法。推及癫狂、蛊毒、中恶、猝魇都可以治愈。
有人说：补土多用燥湿的药剂，如白术等味，与此药有何区别，而迥然不同呢？回答说：治疗血证多不用白术，是担心其燥伤阴液反而加重病情。此药确实是利用阳气来化阴，并非燥伤阴液的药剂。先哲审慎处置，难道会是随便的吗？
This is the yellow earth found beneath the iron cauldron in the center of the stove. Because it is believed that the stove possesses a spirit, its name is thus euphemistically and obscurely referred to. (Tao Hongjing) Do not mistakenly use ordinary earth from under the stove. The so-called *Fulonggan* (Dragon Liver Earth) is formed by the long-term accumulation of fire qi within the stove over ten years, naturally condensing into something resembling red stone, with a yellow center and an octagonal prismatic shape. After obtaining it, grind it into fine powder and use it after being processed by water levigation. (Lei Xiao)
Note: These two descriptions differ, yet cases like those described by Tao are quite numerous.
It tastes pungent and has a slightly warm nature. It primarily treats cough with rebellious qi, hematemesis (vomiting blood), epistaxis (nosebleed), blood in stool due to intestinal wind, hematuria (blood in urine), seminal emission, as well as metrorrhagia and leukorrhea in women. For pregnant women suffering from epidemic febrile diseases causing fetal unrest, it can facilitate the delivery of the placenta. It also treats nocturnal crying in infants, aphasia due to stroke in adults, mania, sudden fright or evil invasion, sudden enchantment, gu poison, and the qi of various sores, carbuncles, and swelling toxins. (Apply mixed with vinegar.) It possesses the wonderful efficacy of Fire generating Earth; dryness can remove dampness, thus making it a holy medicine for stopping bleeding, especially for treating metrorrhagia and collapse due to deficiency. (Langfeng)
For prolonged hematemesis that does not stop, take 2 qian of *Fulonggan*, mixed with rice decoction to swallow, which will stop immediately. For lower gastrointestinal bleeding, take 3 liang each of *Fulonggan*, *Shudihuang* (Prepared Rehmannia Root), *Baizhu* (Atractylodes Macrocephala Rhizome), *Fuzi* (Prepared Aconite Lateral Root), *Ejiao* (Donkey-hide Gelatin), and *Huangqin* (Scutellaria Root), along with 0.5 jin of earth from the stove, decoct in water and take orally. For female blood leakage, take 0.5 liang of *Fulonggan*, 1 liang each of prepared *Ejiao* and stir-fried *Can Sha* (Silkworm Frass), grind into powder, and take 2-3 qian with wine on an empty stomach, until effectiveness is achieved. For chronic red and white leukorrhea with long-standing sallow complexion and faint, choppy pulses in all six positions, take equal parts of *Fulonggan*, palm ash, and dust from above the beam, stir-fry each until smoke ceases, grind into powder, add small amounts of *Longnao* (Borneol) and *Shexiang* (Musk), take 3 qian per dose, swallowed with warm wine or light vinegar soup. For a duration of one year, peace can be achieved within half a month. For febrile disease during pregnancy, take an amount of *Fulonggan* powder equivalent to a chicken egg, mix with water to swallow, and still apply water-mixed paste to a square-cun area of the umbilicus, reapplying when dry. For stroke with locked jaw, aphasia, mental restlessness and confusion, inability to move limbs voluntarily, abdominal pain and fullness, or apparent death followed by revival, take 5 sheng of *Fulonggan* powder, 8 sheng of water, stir, clarify, and take the liquid. For regurgitation and vomiting of food, take powder made from old stove earth, swallow 3 qian with rice decoction. This formula also treats stomach deficiency. For infant erysipelas, mix powder of old stove earth with rainwater collected from eaves to apply; fresh drawn water is also acceptable, as are egg white or oil. Change when dry. For chronic ulcerative sores, grind fine old earth from inside the stove, add *Huangbai* (Phellodendron Bark), *Huandan* (Lead Monoxide), *Chishizhi* (Red Halloysite), and *Qingfen* (Calomel).
[Discussion] *Fulonggan* is a remedy for regulating the Spleen and Liver, presumably drawing upon the principle of Fire generating Earth to serve as the primary treatment for various conditions. In the human body, only the Spleen and Stomach correspond to this, serving as the master of the Central Earth, while the function is governed by the Liver associated with Wind transformation. However, the meaning of Fire generating Earth, if merely understood as dryness removing dampness, remains superficial and fails to grasp its subtleties. Although the Spleen and Stomach govern the transformation of damp Earth and participate in the vigorous movement akin to Heaven's strength, this is because the true Fire within Water acts as the mother qi. If Earth does not receive the Fire from Water, damp Earth cannot perform its transformations; if Water does not have Earth as its master, Cold Water cannot perform its transformations. When Earth and Water combine their virtues to establish the substance of Earth, they may become mutually constrained. This causes Yin alone to act as the sole messenger, losing the mother qi of Water below and the functional qi of Earth in the middle. Instead of suffering from Wind deficiency leading to Wind disasters, it might instead bully the Earth it overcomes. (This expands upon Qian Zhongyang's theory of using yellow earth to treat convulsions.) Therefore, one must base actions on the principle of Fire generating Earth, allowing Water and Earth to settle in their proper places, and further rely on the virtue of Water and Earth combining, enabling Wood and Earth to utilize each other, thereby preserving the generative transformation of the Central Earth. Thus, the use of yellow earth is not simply to remove dampness arbitrarily, but precisely to use Yang to transform Yin, allowing dampness to transform and move. Once dampness transforms, Blood is generated. Hence, treating blood disorders relies not on astringency and consolidation, but on replenishing the source of generation and transformation, which constitutes solidifying collapse. Extending this logic, metrorrhagia and leukorrhea in women, and seminal emission in men, are also effective. This is not merely using its drying property, but rather transforming Yin to harmonize Yang, thereby calming Wind transformation. When Wind transformation calms, Qi becomes harmonious. Therefore, treating Wind disorders relies not on dispersing and venting, but on benefiting the source of combined transformation, which constitutes quieting Wind. Extending this, mania, gu poison, evil invasion, and sudden enchantment can be cured.
One might ask: Tonifying Earth often uses drying-dampness agents, such as *Baizhu*. How does this herb differ, resulting in such distinct effects? The answer is: Treating blood disorders often avoids *Baizhu* out of fear that its drying nature might injure Yin and exacerbate the condition. This substance indeed uses Yang to transform Yin; it is not a drying-injury agent. Did the ancient sages deliberate carelessly? No.
It should not be used for hematemesis due to Yin deficiency, as it contains fire qi. It should not be used exclusively for severe carbuncles and swelling toxins that are difficult to resolve. (Chen Shigong)
[Processing] Levigate with water twice, then allow to dry.