The Natural History of Pliny, Volume 1 (of 6)

Chapter 87: CHAP. 83. (81.)—SIGNS OF AN APPROACHING EARTHQUAKE.

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The text assembles a systematic survey of the natural world, opening with cosmological and geographical discussions and proceeding through plants, animals, minerals, and human uses of natural substances. It synthesizes reports from earlier authors, travelers, and craftsmen, combining empirical observation, hearsay, and learned commentary to describe physical phenomena, medicinal remedies, technologies, and curiosities. Organized as an encyclopedic sequence of books and chapters, it catalogues facts and theories, cites authorities, and balances practical instruction with natural-philosophical reflection.

CHAP. 83. (81.)—SIGNS OF AN APPROACHING EARTHQUAKE.

There is no doubt that earthquakes are felt by persons on shipboard, as they are struck by a sudden motion of the waves, without these being raised by any gust of wind. And things that are in the vessels shake as they do in houses, and give notice by their creaking; also the birds, when they settle upon the vessels, are not without their alarms. There is also a sign in the heavens; for, when a shock is near at hand, either in the daytime or a little after sunset, a cloud is stretched out in the clear sky, like a long thin line545. The water in wells is also more turbid than usual, and it emits a disagreeable odour546.