I mean the Babylonian bricks, supposed to be four thousand years old, mostly sun-baked, but some apparently kiln-burnt almost to vitrification.

Hardness N. hardness &c adj.; rigidity; renitence^, renitency; inflexibility, temper, callosity, durity^. induration, petrifaction; lapidification^, lapidescence^; vitrification, ossification; crystallization.

The various lectures that have been delivered by the different fellows of this society, on mechanism, chemistry, mineralogy, and metallurgy, have produced very beneficial effects, and contributed in a considerable degree to the improvement of gilding, plating, bronzing, vitrification, and metallurgic combinations.

Given the vitrification, her conduct and discourse were consequent and rational, according to the particulars which Paley drew forth by numerous questions.

This additional source of perplexity was the great change, almost amounting to the vitrification of enamel colours, which occurred in the hues of the various pigments, according to the point of view, and the immense distance of the canvas from the spectator.