Scoriae, in a state of dust, like powdered pumice-stone, and grayish ashes as small as the finest feculae, were held in suspension in the midst of their thick folds.
Des scories à l'état de poussière, telles que de la pouzzolane pulvérisée et des cendres grisâtres aussi fines que la plus fine fécule, se tenaient en suspension au milieu de leurs épaisses volutes.