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 to print, but with the reservation that the necessary alterations should be made, and that after further revision it should go to press in Rome, which conditions, however, had not been able to be fulfilled owing to the plague. The most interesting parts of the letter for us are the hints which Riccardi gives the Inquisitor, in the course of it, as to the Pope's views on the subject, which are to guide him in sanctioning the work. Title as well as contents are only to relate to the mathematical aspects of the Copernican system, and so that "the absolute truth of this view is never conceded, but made to appear as mere hypothesis, and without reference to Scripture" "It must also be explained," continued Riccardi, "that this work is only written to show that all the arguments which can be adduced in favour of this view were well known; that therefore the sentence of 1616 was not to be attributed to ignorance at Rome, and the beginning and end of the book must agree with this statement, which portions, properly arranged, I will send from here. By observance of these precautions the work will meet with no obstacles at Rome, and your reverence will be able to gratify the author, as well as to serve his Highness, who has shown so warm an interest in the matter." The Inquisitor replied on 31st May that he would act in accordance with the received instructions. He says further that he had given the MS. to Stephani, as a very eminent man and counsellor of the Holy Office, to be revised again, and this time in accordance with the papal instructions; also that Galileo consented most willingly to all the corrections.

But it would almost appear as if Riccardi had again repented of the steps he had taken for the final settlement of the business, for weeks and months passed before Fra Clemente Egidio received the preface and conclusion. Not till Niccolini,