The Roman History · Amm. 25.2.6

Some think that sparks falling off from the ethereal fire, as they are able to proceed but a short distance, soon become extinguished; or, perhaps, that rays of fire coming against the dense clouds, sparkle from the suddenness of the contact; or that some light attaches itself to a cloud, and taking the form of a star, runs on as long as it is supported by the power of the fire; but being presently exhausted by the magnitude of the space which it traverses, it becomes dissolved into air, passing into that substance from the excessive attrition of which it originally derived its heat.

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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