(Venice, 1 543); Trojanus Curtius published the two books on Floating Bodies in 1565 after Tartaglia's death; Frederic Cornmandine edited the Aldine edition of 1558, 4to, which contains Circuli Dimensio, De Lineis Spiralibus, Quadratura Paraboles, De Conoidibus et Spheroidibus, and De numero Arenae; and in 1565 the same mathematician published the two books De its quae vehuntur in aqua.
This first essay (Exetasis quadraturae circuli, Leiden, 1651) was quickly succeeded by his Theoremata de quadratura hyperboles, ellipsis, et circuli; while, in a treatise entitled De circuli magnitudine inventa, he made, three years later, the closest approximation so far obtained to the ratio of the circumference to the diameter of a circle.
' See Vera Circuli et Hyperbolae Quadratura (Padua, 1667); and the Appendicula to the same in his Exercitationes geometricae (London, 1668).
Three years later he brought his three great achievements together in compendious form, Quadratura circuli, Cubatio sphaerae, Duplicatio cubi, and as soon as they were once more refuted by Wallis, reprinted them with an answer to the objections, in compliment to the grand-duke of Tuscany, who paid him attentions on a visit to England in 1669 (L.W.
He wrote also De Geometria speculativa (Paris, 1530); De Arithmetica practica (Paris, 1502); De Proportionibus (Paris, 1495; Venice, 1505); De Quadratura Circuli (Paris, 1 495); and an Ars Memorativa, Sloane MSS.
In his De Quadratura Circuli he professed to have solved the problem; and in his Conjectura de novissimis diebus he prophesied that the world would come to an end in 1734.