Product Description: The Tractat de prenostication de la vida natural dels homens, a late fifteenth-century Catalan incunable, draws on a rich tradition of astrological magic, geomancy, Pythagorean numerology, and Hebrew gematria. This practical manual offers a method of determining the birth sign based on calculations performed on the subject s name and his or her mother s name...read more (view table of contents, read Amazon.com's description)