In chemistry, a crucible is a kind of laboratory apparatus[?] that is usually a cup, made of porcelain or an inert metal, used to heat chemical compounds to very high temperatures. One of the earliest uses of platinum was as a material in crucibles, and metals such as nickel and zirconium are used as crucible materials these days.
... advice for submission
to authority, warnings against temptation and how
to resist it, reflections about death and the judgment,
meditations upon the oblation of ...