roperly signifies lime, but has been used by chemists and physicians for a fine powder remaining after the calcination of metals. All metallic calces are found to weigh more than the metal from which they were originally produced. This arises from the metal having combined with oxygen during the process of calcination or burning; and hence in the present chemical nomenclature they are called oxides.

CALX Nativae, in Natural History, a kind of marly earth, of a dead whitish colour, which, if thrown into water, water, makes a considerable bubbling and hissing noise, and has, without previous burning, the quality of making a cement like lime or plaster of Paris.

CALX Viva, or Quicklime, that whereon no water has been cast; in contradiction to lime which has been slaked by pouring water on it.