Many works of philosophy are classed as literature. The Dialogues of Plato (4th century BC) are written with great narrative skill and in the finest prose; the Meditations of the 2nd-century Roman emperor Marcus Aurelius are a collection of apparently random thoughts, and the Greek in which they are written is eccentric. Yet both are classed as literature, while the speculations of other philosophers, ancient and modern, are not. Certain scientific works endure as literature long after their scientific content has become outdated. This is particularly true of books of natural history, where the element of personal observation is of special importance. An excellent example is Gilbert White’s Natural History and Antiquities of Selbourne (1789).

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