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 and for the sake of the great man's memory, one would prefer to leave the subject untouched.

We will now examine this interesting letter more closely. When we call to mind the disquisitions on the relation of Scripture to science, which Galileo wrote to Castelli in 1613, and to the Grand Duchess Christine in 1615, the very beginning is a misrepresentation only excusable on the ground of urgent necessity. He says: "The incorrectness of the Copernican system should not in any case be doubted, especially by us Catholics, for the inviolable authority of Holy Scripture is opposed to it, as interpreted by the greatest teachers of theology, whose unanimous declaration makes the stability of the earth in the centre, and the revolution of the sun round it, a certainty. The grounds on which Copernicus and his followers have maintained the contrary fall to pieces before the fundamental argument of the Divine omnipotence. For since this is able to effect by many, aye, endless means, what, so far as we can see, only appears practicable by one method, we must not limit the hand of God and persist obstinately in anything in which we may have been mistaken. And as I hold the Copernican observations and conclusions to be insufficient, those of Ptolemy, Aristotle, and their followers appear to me far more delusive and mistaken, because their falsity can clearly be proved without going beyond the limits of human knowledge."

After this introduction Galileo proceeds to answer Rinuccini's question. He treats that argument against the Copernican system as delusive, and says that it originates in the assumption that the earth stands still in the centre, and by no means from precise astronomical observation. He