Cum in imo per alumen aut bitumen seu sulphur ignis excitatur, ardore percandefacit terram, quae est supra se; autem fervidum emittit in superiora loca vaporem, et ita, si qui in is locis, qui sunt supra, fontes dulcis aquae nascuntur, offensi eo vapore effervescunt inter venas et ita profluunt incorrupto sapore.
Fire arises underground owing to alum or bitumen or sulphur, and by its heat makes the soil above it to glow. It further sends a warm vapour to the surface of the ground, and whatever springs of sweet water rise in such places, meeting this vapour they surge forth between the cracks and flow without damage to their flavour.
final_alignments\Vitruvius_Architecture_Book_8.json