That this was their purpose was seen in that year when Galileo was forbidden to teach or discuss the Copernican theory, and when were forbidden "all books which affirm the motion of the earth." Henceforth to read the work of Copernicus was to risk damnation, and the world accepted the decree.(48) The strongest minds were thus held fast. If they could not believe the old system, they must PRETEND that they believed it;--and this, even after the great circumnavigation of the globe had done so much to open the eyes of the world! Very striking is the case of the eminent Jesuit missionary Joseph Acosta, whose great work on the Natural and Moral History of the Indies, published in the last quarter of the sixteenth century, exploded so many astronomical and geographical errors. Though at times curiously credulous, he told the truth as far as he dared; but as to the movement of the heavenly bodies he remained orthodox--declaring, "I have seen the two poles, whereon the heavens turn as upon their axletrees." (48) The authorities deciding this matter in accordance with the wishes of Pope V and Cardinal Bellarmine were the Congregation of the Index, or cardinals having charge of the Index Librorum Prohibitorum. Recent desperate attempts to fasten the responsibility on them as individuals seem ridiculous in view of the simple fact that their work was sanctioned by the highest Church authority, and required to be universally accepted by the Church. Eleven different editions of the Index in my own possession prove this. Nearly all of these declare on their title-pages that they are issued by order of the pontiff of the period, and each is preface by a special papal bull or letter. See especially the Index of 1664, issued under order of Alexander VII, and that of 1761, under Benedict XIV. Copernicus's statements were prohibited in the Index "donec corrigantur." Kepler said that it ought to be worded "donec explicetur." See Bertand, Fondateurs de l'Astronomie moderne, p. 57. De Morgan, pp. 57-60, gives the corrections required by the Index of 1620. Their main aim seems to be to reduce Copernicus to the grovelling level of Osiander, making his discovery a mere hypothesis; but occasionally they require a virtual giving up of the whole Copernican doctrine--e.g., "correction" insisted upon for chap. viii, p. 6. For a scholarly account of the relation between Prohibitory and Expurgatory Indexes to each other, see Mendham, Literary Policy of the Church of Rome; also Reusch, Index der verbotenen Bucher, Bonn, 1855, vol. ii, chaps i and ii. For a brief but very careful statement, see Gebler, Galileo Galilei, English translation, London, 1879, chap. i; see also Addis and Arnold's Catholic Dictionary, article Galileo, p.8.