Euclid.

EUCLIDIS ELEMENTORUM Libri XV. Accessit liber XVI. De Solidorum Regularium cuiuslibet intra quodlibet comparatione. Omnes Perspicuis Demonstrationibus, accuratisque scholiis illustrati: nunc aquarto editi, ac multarum rerum accessione post primam editionem locupletati Auctore Christophoro Clavio.

      Francofurti Ex Officine Typographica Nicolai Hoffmanni Sumptibus Ionæ Rhodij 1607. 2 vols. T.p. devices. T.p. to vol. 1 rubricated. ([*]-[g*8]) + 671pp. + 680pp. T.p. devices, numerous diagrams, dec. head and tail pieces. Sporadic browning, second vol. lacking blank to front? marbled paper to pastedowns, old crimson morocco, intricately tooled in gilt to boards and spine in same style and similar design, with scroll corner ornaments and gilt borders surrounding intricate central devices, intricate gilt dec. spines with gilt lettering, some repairs to head of spine of first vol. Part 2 has special t.p.: Euclidis posteriores libri IX.The sixteenth book of the Elements was added by François de Foix, Comte de Candale.Christoph Clau, mathematician and astronomer, born at Bamberg, Bavaria, 1538; died at Rome, 12 February, 1612. Entering the Society of Jesus in 1555, his talent for mathematical research was immediately apparent, known as the Euclid of the sixteenth century, the greatest scholars of his time, such men as Tycho Brahe, Johann Kepler, Galileo Galilei, and Giovanni Antonio Magini, esteemed him highly. However his greatest achievement lay in the profound exposition and masterly defence of the Gregorian calendar reform under Gregory XIII. US$5298