Upon adding to the fuel a small quantity of flux, all the mineral parts thereof can be melted into a liquid slag, which may be carried off just like that of blast furnaces.

From shoulder to hip molten slag pulsed slowly through her veins and great drops of sweat moved from her temples and made white-bottomed rivulets among the smudges of her cheeks.

Its volcanic slag fell again into the chimneys of the crater or rolled down the mountain slopes, falling into the waves.