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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 three circles485, which are connected with the above-mentioned zones, distinguish the inequalities of the seasons; these are, the solstitial circle, which proceeds from the part of the Zodiac the highest to us and approaching the nearest to the district of the north; on the other side, the brumal, which is towards the south pole; and the equinoctial, which traverses the middle of the Zodiac.