雷公云∶凡使，须取新净者，以绢袋盛之；然后用地榆、五花皮、五方草三味各四两，
细锉，了，又以牡蛎约重四、五斤已来，先置于平底铛中，以物四向 令稳，然后着真珠于
上，了，方下锉了三件药，笼之，以浆水煮三日夜，勿令火歇；日满出之，用甘草汤淘之令
净后，于臼中捣令细，以绢罗重重筛过，却，更研二万下了用。
凡使，要不伤破及钻透者，方可用也。
雷公云∶凡使，勿用诸杂树上生者螺螺，不入药中用。凡采觅，须桑树东畔枝上者。
凡采得，去核子，用沸浆水浸淘七遍，令水遍沸，于瓷锅中熬令干用。
勿乱别修事，却无效也。
雷公云∶凡使，即是真珠母也。先去上粗皮，用盐并东流水于大瓷器中煮一伏时；了，
漉出，拭干，捣为末，研如粉；却，入锅子中，再用五花皮、地榆、阿胶三件，更用东流水
于瓷器中，如此淘之三度；待干，再研一万匝，方入药中用。
凡修事五两，以盐半分取则，第二度煮，用地榆、五花皮、阿胶各十两。
服之十两，永不得食山桃，令人丧目也。
雷公云∶凡使，勿用游波蕈骨。其虫骨真似海蛤，只是无面上光。其虫骨误饵之，令人
狂走拟投水，时人为之犯鬼心狂，并不是缘，曾误饵此虫骨。若服着，只以醋解之，立瘥。
水中淘三遍；拭干，细捣，研如粉，然后用。
凡一两，用地骨皮、柏叶各二两，并细锉，以东流水淘取用之。
Lei Gong said: When using *Hai Ge* (Clam Shell, *Meretrix meretrix*), one must select fresh and clean specimens, place them in a silk bag; then take four taels each of *Diyu* (Sanguisorbae Radix, 地榆), *Wuhua Pi* (Bark of Five-Flower Tree, 五花皮), and *Wufang Cao* (Herb of Five Directions, 五方草), cut them finely. Next, place approximately four to five jin of *Muli* (Oyster Shell, 牡蛎) in a flat-bottomed pan, secure it firmly with objects on all sides, then place the pearls (*Zhenzhu*, 真珠) on top. After placing the pearls, add the three chopped herbs, cover the vessel, and decoct with fermented rice water (*Jiangshui*, 浆水) for three days and nights without letting the fire go out. Upon completion, remove the specimen, wash it thoroughly with licorice root decoction (*Gancao Tang*, 甘草汤), pound it into fine powder in a mortar, sieve it repeatedly through a silk cloth, and grind it further twenty thousand times before use.
When using *Hai Ge*, ensure that the shells are not broken or perforated; only such intact specimens are suitable for medicinal use.
Lei Gong said: Do not use snails growing on miscellaneous trees for medicinal purposes. When harvesting, select those found on the eastern branches of mulberry trees. After harvesting, remove the inner core, soak and rinse seven times with boiling fermented rice water until the water remains boiling, then dry them in a porcelain pot before use. Do not arbitrarily alter the processing method, as this will render the medicine ineffective.
Lei Gong said: This refers to *Zhenzhumu* (Mother-of-Pearl, 真珠母). First, remove the rough outer skin. Boil it in a large porcelain vessel with salt and flowing water from east to west for one *shi* (two hours). Remove, wipe dry, pound into powder, and grind until fine. Then, return it to the pot, add *Wuhua Pi*, *Diyu*, and *Ejiao* (Donkey-hide Gelatin, 阿胶), and rinse three times with flowing water from east to west in a porcelain vessel. Once dry, grind it ten thousand times more before incorporating it into prescriptions. For every five taels processed, use half a tael of salt as a standard for the second boiling; for this step, use ten taels each of *Diyu*, *Wuhua Pi*, and *Ejiao*. While taking ten taels of *Zhenzhumu*, one must never consume wild peaches (*Shantao*, 山桃), as this may cause blindness.
Lei Gong said: Do not use *Youbo Xun Gu* (Bone of the Swimming Mushroom Fungus, 游波蕈骨). This insect bone resembles *Hai Ge* closely but lacks surface luster. If mistakenly ingested, it causes madness characterized by running wildly and attempting to jump into water; people at the time called this "ghost-induced mania," but it is actually due to the toxicity of this insect bone. If ingested, antidote with vinegar for immediate recovery. Wash *Hai Ge* three times in water, wipe dry, crush finely, and grind into powder before use. For every one tael of *Hai Ge*, use two taels each of *Digupi* (Cortex Lycii, 地骨皮) and *Boye* (Cupressi Cacumen, 柏叶), cut finely, and rinse with flowing water from east to west before use.