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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.
A bright light has been seen proceeding from the heavens in the night time, as was the case in the consulship of C. Cæcilius and Cn. Papirius, and at many other times, so that there has been a kind of daylight in the night310.