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…of Kircher. I. The Central Fire A, through certain Fire-ducts, or Channels, diffuses round about, every where, far and near fiery exhalations and spirits. These driven into the Water-houses, it partly disposes into hot Baths; partly attenuates or rarifies into vapours; wich dashing, as it were, against the Arches or Vaults of Concavous Dens, and condens‘d…
https://www.wichita.edu/academics/fairmount_las/geology/wparcell/Kircher/volcanoes/epistle.php