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…hiring an honest Country-man, for a true and skilfull companion, and guide of the wayes; (not without indeed an ample reward) I ascended the Mountain at midnight, through difficult, rough, uneven, and steep passages. At whose crator or mouth, when I arrived, I saw what is horrible to be expressed, I saw it all over of a light fire, with an horrible…
https://www.wichita.edu/academics/fairmount_las/geology/wparcell/Kircher/volcanoes/chapter5.php