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The VULCANO’S OR, Mountains vomiting Fire, famous in the World;with their Remarkables. CHAP. I.Of Subterraneous Abysses, and Conservatories, or Store-houses of Fire; the Original Cause and Source of all fiery Eruptions, and Vulcanos. That there are Subterraneous Conservatories, and Treasuries of Fire (even as well, as there are of Water, and Air, &c.) and…
https://www.wichita.edu/academics/fairmount_las/geology/wparcell/Kircher/volcanoes/chapter1.php