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An encyclopedic survey that first catalogs marine animals, algae, and shellfish, describing habitats, curious behaviors, reported antipathies, and numerous folk remedies and practical uses attributed to specific species, organized by ailments and applications. The later portion treats metals and their ores—including gold, silver, mercury, copper, and brass—describing modes of occurrence, extraction, alloying, testing, gilding, and decorative and monetary uses, alongside technical observations and medicinal remedies derived from metallic substances, with systematic lists and practical instructions interwoven throughout.
There is also a stone known as “leucochrysos,”3182 with a white vein running across it. To this class, too, belongs capnias;3183 a stone also which resembles glass in appearance; and another which reflects a tint like that of saffron. These stones are imitated in glass, to such a degree of perfection, that it is impossible to distinguish them by the eye. The touch, however, detects the difference, the imitation being not so cold as the real stone.