Philosophical Transactions, Volume 4…
“ As to the matter, which thus ran, it was nothing else, but divers kinds of Metals and Minerals, rendred liquid by the fierceness of the Fire in the bowels of the Earth, boyling up and gushing forth, like the water doth at the head of same great River; and having run in a full body for a good Stones cast or more, the extreamities thereof began to crust and curdle, becoming, when cold, those hard porous Stones, which the people call Sciarri, having the nearest resemblance to huge Cakes of sea-cole; full of a fierce Fire. ”
