This article relies largely or entirely on a single source. (December 2009)
Baro or Baru Urbigerus was a seventeenth-century writer on alchemy. He is known for his Aphorismi Urbigerani (1690). 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.
- Also known as Baron Urbiger; it is speculated[who?] that he was English, and may have used Borghese also as a pseudonym.
- The Alchemy Web Site. Important German edition Besondere Chymische schrifften, Hamburg 1703. There is a 1986 edition as One Hundred Alchemical Aphorisms and the Summary of Philosophy.
- The Alchemy Web Site. Illustrated by Frater Albertus; this book is available in modern translation under the title The Philosophical Elixir of Vegetables.