此水中射工，又有树上毛虫，亦名射工者，见后毛虫伤方。射工，一名溪鬼虫，又名射
影，又名水弩，出南方有溪毒处。长二三寸，宽寸许，形扁，前宽后窄，腹软背硬，如蝉，
又如鳖；六七月甲下有翅能飞，作铋铋声；宽头尖嘴，嘴头有角如爪，长一二分；有六足，
如蟹足，两足在咀下，大而一爪，四足在腹下，小而双爪；口有弩形，以气射人影，去人三
、四步即中，令人发疮，不治即死。病有四种∶初得皆如伤寒，或似中恶。一种遍身有
子，四边微红，犯之如刺；一种作疮，久则穿陷；一种突起如石；一种如火烧状。
又有溪毒中人，一名中水，一名中溪，一名水病。似射工而不见形，春月多有此病症。
头痛恶寒，状如伤寒，二三日则腹中生虫，食人下部，渐食五脏，注下不禁，虽良医难治。
初得则下部有疮红赤，形如截肉为阳毒，最急。若疮如虫啮为阴毒，其势稍缓，皆能杀人，
过二十日，不治。方家用药，与伤寒、瘟病相似，须用苍耳草绞汁服一二升，并用棉蘸汁浓
敷下部，或以小蒜煮微热汤（不可大热，大热则无力）洗之，若身发赤斑，其毒已出也。
又方∶取豉母虫一枚，含入口中立愈，虽死亦活；或用盐梅裹含之亦可；此葛仙《肘后
方》也。豉母虫，一名豉虫，光黑，大如豆，浮游水上者即是。
又方∶猪血饮之即解。
又方∶知母连根叶研末服，或投水绞汁饮一二升，煮汤洗浴亦佳。夏月出行多带知母，
连根捣碎，投水上流，可避此毒。
又方∶鸡粪（要白色者）与糯米糖调敷，效。
又方∶苍耳草嫩苗（生草药店有买）取汁和酒温灌之，其渣浓敷伤处，甚效。
又方∶芥菜子末，和酒浓敷，半日止痛。
又方∶马齿苋，捣汁一升服，以渣敷之，日四、五次。
又方∶皂角，长尺余者，好醋煮浓汁如膏敷之。
又方∶白鹅血饮之，并敷其身，极效。
又方∶夜睡时，以手摩身体有辣痛，熟视当有赤点如针头，急捻之，以芋头叶入内刮出
细沙，以蒜敷之，即愈。又痛处有刺如虾须。用芋头及甘蔗叶屈角入内，勾出其根则愈。迟
则其根入骨难治。
This "Shegong" (Arrow Worker Insect) in the water, along with the hairy caterpillars on trees (also named Shegong), are detailed later in the section on "Hairy Caterpillar Injury". Shegong is also known as Xigui Chong (Stream Ghost Insect), or Shaying (Shadow Shooter), or Shuinu (Water Crossbow). It appears in southern regions where stream toxins exist. It is two to three cun long and about one cun wide, flat in shape, wider at the front and narrower at the back, soft on the belly and hard on the back, resembling a cicada or a turtle; from the sixth to seventh lunar months, it has wings under its abdomen that allow it to fly, making a "bi-bi" sound; it has a broad head and pointed mouth, with horn-like claws at the tip of the mouth, one to two fen long; it has six legs like crab legs, two located under the mouth, large with a single claw, and four located under the abdomen, small with double claws; its mouth resembles a crossbow, capable of shooting its breath at a person's shadow, hitting them from three or four paces away, causing sores. If untreated, it leads to death. There are four types of illness: initially, all resemble Taiyang disease (Exterior Syndrome of the Bladder Channel) or sudden severe poisoning. One type presents with widespread nodules on the body, slightly red around the edges, feeling like needle pricks upon contact; another type forms sores that eventually perforate and sink; another type protrudes like stone; and another type looks like a burn.
There is also "stream toxin entering the human body", known as Zhongshui (Water Poisoning), Zhongxi (Stream Poisoning), or Shuibing (Water Disease). It resembles Shegong but the insect is invisible, occurring frequently in spring. Symptoms include headache and aversion to cold, resembling Taiyang disease. After two to three days, worms may develop in the abdomen, eating the lower parts of the body, gradually invading the five zang organs, leading to uncontrollable diarrhea, which is difficult even for skilled physicians to treat. Initially, there are red, raw sores in the lower region, resembling cut flesh, classified as Yang Du (Yang Toxin), which is most acute. If the sores resemble insect bites, it is classified as Yin Du (Yin Toxin), with a slightly slower progression, yet both can be fatal if untreated beyond twenty days. The herbal remedies used by physicians are similar to those for Taiyang disease and epidemic febrile diseases. One must administer one to two sheng of juice extracted from Xanthium herb (Cang'er Cao) orally, and apply thick cotton soaked in the juice densely to the lower region. Alternatively, wash the area with a decoction of Allium macrostemon (Xiao Suan) prepared at a warm temperature (not too hot, as excessive heat reduces efficacy). If red spots appear on the body, it indicates the toxin has been expelled.
Another prescription: Take one Daimu Chong (Fermented Bean Insect), place it in the mouth, and cure immediately; even if dead, life can be restored. Alternatively, wrap it in salted plum and hold it in the mouth. This is recorded in Ge Xian's *Zhouhou Fang* (Emergency Prescriptions for Handbooks). Daimu Chong, also known as Chi Chong, is shiny black, bean-sized, and found floating on the water surface.
Another prescription: Drink pig blood to detoxify.
Another prescription: Grind Rhizoma Anemarrhenae (Zhimu) including roots and leaves into powder and ingest, or drink one to two sheng of juice extracted from water. Bathing in the decoction is also beneficial. During summer travel, carry more Rhizoma Anemarrhenae, crush it with roots, and throw it into the upstream water to avoid this toxin.
Another prescription: Mix chicken manure (preferably white) with glutinous rice sugar and apply topically. Effective.
Another prescription: Extract juice from young shoots of Xanthium herb (available fresh in herbal shops), mix with wine, and take warm. Apply the residue densely to the injured area. Very effective.
Another prescription: Mix mustard seed powder with wine and apply densely. Relieves pain within half a day.
Another prescription: Crush Portulaca oleracea (Machi Xian) to extract one sheng of juice for oral administration, and apply the residue topically, four to five times daily.
Another prescription: Use Gleditsia sinensis (Zao Jiao) over one chi long, boil with good vinegar until a thick paste forms, and apply topically.
Another prescription: Drink white goose blood and apply it to the body. Extremely effective.
Another prescription: When sleeping at night, massage areas of the body that feel burning and painful. Upon close inspection, you may find red dots like needle heads. Pinch them urgently, insert a leaf of Colocasia esculenta (Yutou Ye) inside to scrape out fine sand, then apply garlic topically for immediate healing. Additionally, spines like shrimp whiskers may appear at the painful site. Insert the bent corner of a Colocasia esculenta leaf or sugarcane leaf into the wound to hook out the root. Healing occurs once the root is removed. Delay allows the root to penetrate the bone, making treatment difficult.