(Chapter 20) Footnote 9:

The 1555 edition omits this section and concludes the chapter as follows: “So too with Galen’s entire account of the bone of the heart, in which he wrongly accuses the ancients and the doctors of his time who deny that it is found in man; we too must acknowledge that Galen never worked on the bone which he describes in a human heart, which is especially damp and soft, as we have stated.” In a marginal note, Vesalius cites “especially book 8 of De anatomicis administrationibus,” on which see note 4 above.