(Chapter 11) Footnote 20:

The idea that secondary dentition grows on the same roots as the primary has been traced as far back as Celsus, De med. 8.1.10: Exque eadem radice in pueris novus dens subit. Vesalius’ failure to recognize distinct primary and secondary dentitions, and his erroneous description of primary dentition as a kind of epiphysis, was politely noted by Fallopio in Observationes anatomicae (1584): “Because anatomists see that children’s teeth are sometimes extracted which are imperfect at the end, soft, and almost hollow, they have come to the conclusion that teeth are endowed with appendices which fall out when the beginning of the rest of a tooth grows up beneath it. The divine Vesalius would in truth not have said so if in completing his work (whose merit cannot be denied him) he had observed the skulls of children with the greatest care, and particularly of those who were born still incomplete because of a miscarriage,” etc. (fols. 230r-231v).