雷公云∶凡使，勿用薄荷根茎，真似紫苏茎，但叶不同。薄荷茎性燥，紫苏茎和。
凡使，刀刮上青薄皮，锉用也。
雷公云∶凡采得，去根，留叶，细锉，曝干。
勿令犯火。
服至十两，一生不得食白山桃也。
雷公云∶凡使，勿用诸件。草形似牛皮蔓，掐之有乳汁出，香甜入顶。
凡采得，用苦竹刀细切，入砂盆中研如膏，用生稀绢裹， 取汁出，暖饮。
雷公云∶凡使，勿误用灶下土。其伏龙肝，是十年以来，灶额内火气积，自结如赤色石
，中黄，其形貌八棱。
凡修事，取得后，细研，以滑石水飞过两遍，令干，用熟绢裹，却，取子时，安于旧额
内一伏时，重研了用。
雷公云∶凡使，用醋浸一宿，漉出，待干。下火 令腥秽气出，用瓶盛，着密盖，放冷
，拭上灰令净，细研用。
雷公云∶凡使，用小瓷瓶子盛后，入紫背天葵、石龙芮二味，三件便下火 ，从巳至申
，便用甘草水浸，从申至子，出，拭干，却入瓶盛，于火中 ，别研三万下用之。
雷公云∶铜气凡使，在药中用时，即浑安置于药中，借气生药力而已。
勿误入药中用，消人脂也。
雷公云∶凡使，不计多少，用蜡水细研尽，重重飞过，水面上有赤色如薄云者去之。然
后用细茶脚汤煮之一伏时，了，取出，又研一万匝方入。用净铁铛一口，着火，得铛热底赤
，即下白蜡一两于铛底，逡巡间，便投新汲水冲之于中，沸一、二千度了，如此放冷，取出
使之。
Lei Gong said: When using Perilla Frutescens (Zisu), do not use the root and stem of Mentha haplocalyx (Bohe), as they resemble the stems of Perilla, differing only in the leaves. The stems of Mentha are dry and hot in nature, whereas the stems of Perilla are harmonious and mild.
When preparing Perilla, scrape off the thin green skin on the surface with a knife, then chop it for use.
Lei Gong said: After harvesting, remove the roots, retain the leaves, chop them finely, and dry them in the sun.
Do not expose them to fire.
If taken up to ten taels, one must never consume white mountain peach (Baishantao) throughout their life.
Lei Gong said: When using [certain herbs], do not use those resembling cowhide vines; when pinched, they exude latex, and their sweet fragrance is pungent to the head.
After harvesting, cut them finely with a bitter bamboo knife, grind them into a paste in a mortar, wrap them in raw fine silk, squeeze out the juice, and drink it while warm.
Lei Gong said: Do not mistakenly use earth from under the stove. What is called "Fulonggan" (Dragon Liver lying hidden) is fire energy accumulated within the stove mouth over ten years, naturally congealed into red stones, yellow in the center, with an octagonal shape.
When processing, after obtaining it, grind it finely, pass it through water levigation twice using Talcum (Huashi), let it dry, wrap it in cooked silk, place it back in the old stove mouth for one shichen (two hours), re-grind it, and then use it.
Lei Gong said: When using, soak it in vinegar overnight, drain it, and wait until dry. Apply heat to drive out fishy and foul odors, store it in a bottle with a tight lid, let it cool, wipe clean the dust on top, grind it finely, and use it.
Lei Gong said: When using, place it in a small porcelain bottle, add two ingredients: Kochia Scoparia (Zibeitiankui) and Ranunculus ternatus (Shilongrui). Heat these three items together from Si hour to Shen hour, then soak them in Licorice Root (Gancao) water from Shen hour to Zi hour. Remove, wipe dry, put back into the bottle, heat in the fire, grind another thirty thousand times, and then use.
Regarding the Qi of copper vessels: When used in medicine, place the whole vessel among the herbs to borrow its Qi to generate medicinal power.
Do not mistakenly put it into the medicine, as it consumes human fat.
Lei Gong said: When using, regardless of quantity, grind it finely with wax water, repeatedly performing water levigation. Discard any red color on the water surface resembling thin clouds. Then, boil it in strong tea residue water for one shichen. After completion, remove it, grind it ten thousand more turns before incorporating it. Use a clean iron wok, heat the fire until the bottom of the wok turns red, then drop one tael of white beeswax onto the bottom of the wok. In a moment, immediately pour newly drawn water into it to shock it. Let it boil one or two thousand times, then let it cool, remove, and prepare for use.