(Chapter 34) Footnote 13:

On this point, Vesalius sides with Galen (see note 9 above) and again paraphrases his language: “Some think [homogeneous particles like the nails] come into being as a mingling of bone, sinew, and skin, to which some add flesh.” ( op. cit. 2.335.2-4, tr. Singer 1956, p. 58).