till July 8. It is evident, from all the documents of that time, that it had disappeared from sight several days before the battle of Belgrade. These two simultaneous facts–the publication of the bull and the appearance of the comet–were connected by Platina in the following manner: Apparente deinde per aliquot dies cometa crinito et rubeo: cum mathematici ingentem pestem: charitatem annonæ: magnam aliquam cladem futuram dicerent: ad avertendam iram Dei Calistus aliquot dierum supplicationes decrevit: ut si quid hominibus immineret, totum id in Thurcos christiani nominis hostes converteret. Mandavit præterea ut assiduo rogatu Deus flecteretur in meridie campanis signum dari fidelibus omnibus: ut orationibus eos juvarent: qui contra Thurcos continuo dimicabant (A maned and fiery comet appearing for several days, while astrologers were predicting a great plague, dearness of food, or some great disaster, Callistus decreed that supplicatory prayers be held for some days to avert the anger of God, so that, if any calamity threatened mankind, it might be entirely diverted against the Turks, the foes of the Christian name. He likewise ordered that the bells be rung at midday as a signal to all the faithful to move God with assiduous petitions and to assist with their prayers those engaged in constant warfare with the Turks). Platina has, generally speaking, recorded the facts truly; but is wrong at one point, viz., where he says that the astrologers' predictions of great calamities induced the pope to prescribe public prayers. The bull does not contain a word on the comet, as can be verified in the original, authenticated document. A careful investigation of the authenticated Regesta of Callixtus (about one hundred folios), in the Vatican archives, shows that the comet is not mentioned in any other papal document. Nor do other writers of the time refer to any such prayers against the comet, though many speak both of the comet and of the prayers against the Turks. The silence of St. Antoninus, Archbishop of Florence (1446–1459), is particularly significant. In his Chronicorum libri tres he enumerates accurately all the prayers prescribed by Callixtus; he also mentions the comet of 1456 in a chapter entitled, – but never refers to prayers and processions against the comet, although all papal decrees were sent to him. Aeneas Sylvius and St. John Capistrano, who preached the crusade in Hungary, considered the comet rather as a favourable omen in the war against the Turks.