Calefaction N. increase of temperature; heating &c v.; calefaction^, tepefaction^, torrefaction^; melting, fusion; liquefaction &c 335; burning &c v.; ambustion^, combustion; incension^, accension^; concremation^, cremation; scorification^; cautery, cauterization; ustulation^, calcination; cracking, refining; incineration, cineration^; carbonization; cupellation

They were submitted to a number of tests which induced Mr. Macie to believe that they consisted principally of silica, but that before calcination some vegetable matter must have been present.

Unfortunately, too, it is the custom of the natives to prepare the substance for the market by an imperfect calcination, and hitherto I have only been able to study specimens procured in the markets which have been subjected to this process.