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12 . 5 . G , 34 A handwritten library shelfmark used for organizing books in a collection.
Three library stamps from the National Library of Naples are visible on the left side of the page. The top one is a faint rectangular stamp; the middle is a circular stamp with "V. E. III" (referring to Vittorio Emanuele III) in the center; the bottom is a large oval stamp.
The following text is the mirrored image of the title page, visible through the paper:
NATIONAL LIBRARY OF NAPLES
NATIONAL LIBRARY OF NAPLES V. E. III
NATIONAL LIBRARY OF NAPLES
Happy is he who was able to understand the causes of things. original: "Felix qui potuit rerum cognoscere causas" — a famous quotation from the Roman poet Virgil's Georgics (2.490), celebrating the power of scientific and philosophical inquiry to overcome superstition.