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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.
The trabes also, which are named δοκοὶ299, shine in the same manner; one of these was seen at the time when the Lacedæmonians, by being conquered at sea, lost their influence in Greece. An opening sometimes takes place in the firmament, which is named chasma300.