[555] Op. xv. (Viviani), p. 371.
[556] Comp. Castelli’s letters to Galileo of 29th May and 30 July, 1638. (Op. x. pp. 300, 310-313.)
[557] Cioli’s despatch to Niccolini of 9th Sept., 1638. (Op. x. pp. 313, 314.)
[558] Niccolini’s despatches to Cioli of 15th and 25th Sept. (Wolynski, “La Diplomazia Toscana,” etc., pp. 68, 69.)
[559] Fanano’s letter to Card. Barberini of 4th Oct. (Op. x. p. 314.)
[560] See Castelli’s letters to Card. F. Barberini of 2nd, 9th, and 16th Oct., in Pieralisi, pp. 291-296; and another of 23rd Oct., 1638, on an unnumbered page between fols. 552 and 553 of the Vat. MS. p. 175.
[561] See Card. Barberini’s letters to Castelli of 16th and 30th Oct. (Pieralisi, pp. 294, 295, and 298.)
[562] Vat. MS. fol. 557 vo.
[563] “Discorsi e Dimostrazione Matematiche intorno a due Scienze attenenti alla Meccanica e ai Movimenti Locali. Con una Appendice del Centro di gravita di alcuni Solidi.”
[564] See Galileo’s letter to the Count de Noailles of 6th March, 1638, and his answer of 20th July. (Op. vii. pp. 209-211, and x. pp. 308-310.)