河南薛姓客言∶曾在嘉兴永太守处，见有龙泄结成大块，其质亦轻，有六七两及斤许不
等。
每块皆起螺旋纹，如象牙花纹，其色有纯黑有褐白二种；欲辩真伪，刮屑少许，以滚水泡之
，其气悉 而成云，遇妇人，云辄扑入发际，旋绕不散，盖龙性好淫故也。人服之，入腹亦
不耗，惟见鸡汤辄化。如服后不食鸡汤，次日粪出，其药仍在，色亦不改，淘出洗净，复可
再用，气亦不臭。其功效，食之能暖妇人子宫，治男子下元虚冷，入房术中用。又史良宇言
∶曾见龙血结块如棋子大，光滑可鉴，触手冷如冰。夫龙，纯阳也，而血独冷，又不解何故
。龙泄又何物也，其涎与血欤，抑精与溺欤，俱不可知，悉存其说以俟证。
坤舆图说∶大东洋海产鱼名西楞，上半身如男女形，下半身则鱼尾，其骨入药用，女鱼
更效
止血，治一切内伤瘀损等症。
本经逢原鲥鱼性补，温中益虚，而无发毒之虑。其生江中者，大而色青，味极甘美。生
海中
者，小而色亦，味亦稍薄。观其暗室生光，迥非常鱼可比。 纲目主治，言其肉补虚劳，油
涂汤火伤，于集解下记其鳞为妇人钿饰，不及入药功用。 张佳时云∶鲥鱼须乘活时，拔划
水边二鳞，尖长者佳；若死鱼鳞，便减药力。
汤火伤 逢原云∶用鲥鱼鳞香油熬涂，立效。茅集之云∶鲥鱼鳞贴腿疮疼痛，立效。
治疔 陈氏传方∶疔疮用鲥鱼鳞粘贴，则咬紧，先须与酒饭吃饱，然后将鱼鳞边略略揭
起些
，须用力急揭去，疔根便带出也。但揭出疔根时，极痛无比，非醉饱，即晕倒也。傅氏方∶
水疔，用鲥鱼腮下近腹处有划水二瓣，瓣间有长鳞二瓣，最佳，但难得；今人以背上大鳞代
之
，粘贴即消。 毛世洪经验集∶鲥鱼靥用手剖下，不可见水，阴干收贮，此拔疔第一妙药也
。用时以银针拨开疔头，将一片粘贴，以清凉膏盖之，俟一宿揭开，其疔连根拔出，后用生
肌散收功。予治两贵妇大脚趾患疮，二三年不收功，将靥一片，以银花汤浸软拭干贴之，不
数日而愈。
下疳 救生苦海∶鲥鱼鳞焙干 研白色，名白龙丹，敷之即愈，得此可包医。
血痣 蔡云白言∶人生血痣，挑破血出不止者，用鲥鱼鳞贴之，即痂而愈。
河南一位姓薛的客商说：曾经在嘉兴永太守家中，见过龙泄凝结成的大块物体，其质地也很轻，重量有六七两及一斤左右不等。每一块都呈现出螺旋状的纹路，如同象牙上的花纹，颜色有纯黑和褐白两种；想要辨别真伪，刮取少许碎屑，用滚开水冲泡，其气味全部化作云雾状，遇到妇女时，云雾就会扑向发际线，盘旋环绕不散开，这是因为龙性好淫的缘故。人服用后，进入腹中也不会消耗，只有见到鸡汤才会融化。如果服用后不喝鸡汤，第二天排便时，药物仍然完整排出，颜色也没有改变，淘洗干净后可以再次使用，气味也不臭。它的功效是，食用能温暖妇女子宫，治疗男子下元虚冷，在房中术中使用。另外史良宇说：曾经见过龙血凝结成块，大小如棋子，表面光滑可照见人影，触摸起来冰冷如冰。龙是纯阳之物，但血液却唯独寒冷，这又无法解释原因。龙泄又是什么东西呢？是龙的涎液与血液吗？还是精液与尿液呢？都无法知晓，暂且保留这些说法以等待验证。
《坤舆图说》记载：大东洋海中出产一种名为西楞的鱼，上半身像男女人的形状，下半身则是鱼尾，其骨骼入药使用，雌性鱼的疗效更佳，能止血，治疗各种内伤瘀损等病症。
《本经逢原》记载鲥鱼性味补益，温中益气补虚，而没有引发毒邪的顾虑。生长在江中的鲥鱼，体型大而颜色青，味道极其甘美。生长在海中的鲥鱼，体型小且颜色也（原文缺字，推测为暗或灰），味道也稍淡。观察它在暗室中能发出光芒，完全不同于普通的鱼。《纲目》主治中提到，说它的肉能补虚劳，油脂涂抹可治汤火伤，在集解部分记录其鳞作为妇女的头饰，未提及入药的功用。张佳时说：鲥鱼必须趁活的时候，拔取水边第二片鳞片，尖长的为佳；如果是死鱼的鳞片，药效就会减弱。
治汤火伤：《逢原》记载：用鲥鱼鳞香油熬制后涂抹，立即见效。茅集之说：鲥鱼鳞贴敷腿疮疼痛，立即见效。
治疔疮：陈氏传方：疔疮用鲥鱼鳞粘贴，则咬紧，必须先让患者吃饱酒饭，然后将鱼鳞边缘略微揭起一些，须用力迅速揭去，疔根便会带出来。但在揭出疔根时，疼痛无比，如果不醉饱，就会晕倒。傅氏方：水疔，用鲥鱼腮下靠近腹部处划水的两瓣之间生长的两片长鳞，效果最佳，但很难得到；现在人们用背上的大鳞代替，粘贴即可消除。毛世洪经验集：鲥鱼靥用手剖下，不可见水，阴干收藏储存，这是拔除疔疮的第一妙药。使用时用银针拨开疔头，将一片粘贴，用清凉膏覆盖，等到一夜后揭开，疔疮连根拔出，之后用生肌散收功。我治疗两位贵妇人大脚趾患疮，二三年不好，将一片靥，用金银花汤浸软拭干后贴敷，没几天就好了。
A merchant surnamed Xue from Henan said: He once saw at the residence of Governor Yong of Jiaxing large lumps of "Longxie" (Dragon excretion) that had congealed. The texture was also light, weighing anywhere from six or seven taels to over a jin. Each lump exhibited spiral patterns resembling ivory grain, with colors being either pure black or brownish-white. To distinguish authenticity, scraping a small amount and steeping it in boiling water would cause its aroma to transform into cloud-like vapor. Upon encountering a woman, the vapor would rush towards her hairline, swirling and refusing to disperse, attributed to the dragon's lustful nature. When ingested by humans, it does not dissipate within the abdomen; however, it dissolves upon sight of chicken soup. If no chicken soup is consumed after ingestion, the next day during defecation, the substance remains intact, unchanged in color, and can be washed clean for reuse without emitting an odor. Its efficacy includes warming the uterus in women and treating deficiency-cold in the lower origin (lower jiao/kidney area) in men, used in sexual arts. Additionally, Shi Liangyu stated: He once observed blood of the dragon congealed into chunks the size of chess pieces, smooth enough to reflect images, feeling cold as ice to the touch. Since dragons are purely yang, why their blood alone is cold remains inexplicable. What exactly is "Longxie"? Is it saliva and blood? Or semen and urine? None can be known; these accounts are preserved pending verification.
*Kunyu Tushuo* records: In the Great Eastern Ocean, there is a fish named "Xileng". Its upper body resembles human male or female forms, while the lower body is a fish tail. Its bone is used medicinally, with females being more effective. It stops bleeding and treats various internal injuries and blood stasis lesions.
*Benjing Fengyuan* states that Shiyu (Tenchu) has a tonifying nature, warming the middle and benefiting deficiency, without the risk of triggering toxicity. Those born in rivers are larger, greenish in color, and extremely sweet and delicious. Those born in the sea are smaller, darker in color, and slightly less flavorful. Observing that they emit light in dark rooms, they are far from ordinary fish. *Compendium* mentions its flesh tonifies deficiency and fatigue, and its oil treats scalds and burns. Under the section on collective explanations, it notes its scales were used as women's ornaments but omits medicinal uses. Zhang Jiashi said: Shiyu scales must be plucked when the fish is alive, specifically the second scale near the water line; those that are sharp and long are best. Scales from dead fish have reduced medicinal power.
For treating scalds and burns: *Fengyuan* records: Boiling Shiyu scales in sesame oil and applying them yields immediate results. Mao Jizhi said: Applying Shiyu scales to leg sores relieves pain immediately.
For treating Ding sores (carbuncles/furuncles): Chen's transmitted formula: Apply Shiyu scales to the Ding sore, which will bite tightly. First, ensure the patient eats a full meal with wine and food. Then, slightly lift the edge of the fish scale and pull it off forcefully; the root of the Ding sore will be extracted. However, extracting the root is excruciatingly painful; without being drunk and full, the patient may faint. Fu's formula: For water Ding sores, use two long scales located between the two fin-like lobes under the gills near the belly. These are best but rare; nowadays, people substitute them with large scales from the back, which dissolve the sore upon application. Mao Shihong's Experience Collection: Pluck the Shiyu "ye" (scale/protuberance) by hand, keep it away from water, dry in shade, and store. This is the premier miracle drug for extracting Ding sores. When using, open the head of the Ding sore with a silver needle, apply one piece, cover with cooling ointment, leave overnight, then remove. The Ding sore is pulled out by the root. Afterwards, use Shengji San (Regenerate Flesh Powder) to complete healing. I treated two noblewomen with sores on their big toes that had persisted for two or three years without healing. I soaked a piece of the "ye" in Honeysuckle decoction, dried it, and applied it. Within a few days, it healed.
For treating Chancre (genital ulcer): *Jiusheng Kuhai*: Roast Shiyu scales until dry, grind into white powder, named Bailong Dan (White Dragon Pill). Apply it, and it heals immediately; possessing this guarantees medical success.
For treating Blood Moles (hemangiomas): Cai Yunbai said: When a person develops a blood mole and picking it causes unceasing bleeding, apply Shiyu scales. It will scab and heal.