The Roman History · Amm. 23.6.18

There used, as some affirm, to be a similar chasm near Hierapolis in Phrygia; from which a noxious vapour rose in like manner with a fetid smell which never ceased, and destroyed everything within the reach of its influence, except eunuchs; to what this was owing we leave natural philosophers to determine.

Ammianus Marcellinus · translated by C. D. Yonge · 1911 reprint
C. D. Yonge translation (preface dated February 1862); G. Bell and Sons, 1911; Project Gutenberg #28587
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