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…passages underground, supplies moisture; and together therewith carries a mixture of Terrestrial portion to the Fire-houses, for their food. And these again swelling with hot Spirits, carried upwards, and elevated through wonted Fire-ducts, do with their heat cherish the Water houses, and other kind of Receptacles, whether of Air, or several Juyces of…
https://www.wichita.edu/academics/fairmount_las/geology/wparcell/Kircher/volcanoes/epistle.php