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400 pages, Paperback
First published January 1, 1860

This work bears the title of an essay in the strictest sense of the word.
Echoes of medieval mysticism here flow into one current with Platonic doctrines and with a characteristically modern spirit. One of the most precious fruits of the knowledge of the world and of man here comes to maturity, on whose account alone the Italian Renaissance must be called the leader of modern ages.