葛仙翁曰:至藥未煉,先須燠養之法,至妙且玄。夫含育元黑,滋茂至神,苟有不真,失之俄頃,仙凡頓異,可不謹哉。其法堅石或玉石,為乳槌缽,以乳二物各八兩,令相制入鼎內,面于束向,研三千遍,訖聚之成塊,命日胚暉元始,現天地未兆之形,燠養太和,顯至神潛伏之狀。然後入有蓋土釜中,法泥。泥乾,入灰池,文武火燠七日。玲出之,或紫色,如兩數不足,則火候有失。別作灰池,預作文武火燠之,以備用二十一日,頃刻不可離。故煉丹非三人不可燠養。訖再研之,乃入鼎。鼎中先實黃土為基,厚二寸四分,象二十四黑,安二物於中,乃下火。
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