the double motion of the earth, which gave rise to incidents like that with Bishop Gherardini.[1]
The philosopher, who it is evident was a good deal discomfited, received in reply consolatory assurances from Mgr. Dini and others of his ecclesiastical friends. But they earnestly advised him to treat the subject of the Copernican system purely from the mathematical, physical point of view, and carefully to avoid religious discussion. This hint came rather late in the day, and could not now be of much use to Galileo, when his doctrines were already attacked as heretical, although secretly at that time, and the accusation was based on the purely scientific work on the solar spots. War had been declared with the Copernican system in the name of the Bible.
Galileo's letters to Mgr. Dini of 16th February and 28th March,[2] plainly show how unwillingly he had been driven into the theological field by his opponents. After he had in the second letter decidedly rejected Dini's suggestion that he should treat the Copernican system merely as a hypothesis, he added that it had been his earnest desire to keep strictly to his part as a man of science, and not to be compelled to defend his astronomical system against religious scruples. He entirely agrees with those who say that the task of bringing natural science into agreement with Holy Scripture should be left to theologians, and shows that he has been compelled to defend himself on this dangerous ground. He says besides that his letter to Castelli was not originally intended to go any farther, and regrets that Castelli had had copies made of it without his knowledge.
It is a noteworthy circumstance that at the very time when the secret denunciation had been laid before the tribunal of the Inquisition at Rome, all the letters and reports which Galileo received from Rome, even from trustworthy friends, Mgrs. Dini, Ciampoli, and Prince Cesi, were calculated to allay his anxious fears. None of those persons, although in
