FERNEL, Jean.

De Proportionibus Libri Duo. Prior, qui de simplici proportione est, & magnitudinum & numerorum tum simplicium tum fractorum rationes edocet: Posterior, ipsas proportiones comparat: earumque rationes colligit.

Title within Colines's fine woodcut "Quadrivium" border & criblé initials. 4 p.l., 24 leaves. Folio, attractive antique panelled calf (title a little soiled). Paris: S. de Colines, 1528. First edition of this very rare book; it "is one of the best of the sixteenth-century treatises on the mediaeval proportion. It follows the Boethian treatment, as seen also in the work of Bradwardin."­Smith, Rara Arithmetica, p. 157. "Fernel (1497-1558), before making a name for himself in medicine, was first attracted by the mathematical sciences, as evidenced by his first three publications -- of which this is the third, and all three of which were issued by Simon de Colines: De Proportionibus was preceded by Monalosphaerium, 1527, and Cosmotheoria, 1528. Fernel received his M.D. degree in 1530 and became a very influential physician through his numerous writings; he became physician to Catherine de Médicis, whose barrenness he cured, and eventually was appointed chief physician to King Henri II."­Schreiber 35. Fine unpressed copy. Renouard 117. Sherrington, Fernel, p. 189 (3.C).

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