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Baro, Baru or Baron Urbigerus was a seventeenth-century writer on natural philosophy and alchemy. [1] He is known for his Aphorismi Urbigerani (1690). [2] This collection of 100 aphorisms claims to set out completely the theory of the alchemical work, the preparation of the Philosopher's Stone. A shorter collection of 31 aphorisms, contained in it, is known as the Circulatum Minus Urbigeranum. [3] This work exists in German and English versions.