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…Cavernous and Fistulous, and pervious to the penetrating Winds, and under-ground Fires, and inflammable Spirits; and within abounding with Sulphur, Bitumen, and other fit Fuel and Materials, &c. And so is most convenient both for inward Combustions, and outward Ventilations, and thereby for the extreamest Inflamations and Burnings. But the Original Sourse…
https://www.wichita.edu/academics/fairmount_las/geology/wparcell/Kircher/volcanoes/chapter6.php