The idea of a table of contents or index is not a new one; in fact, even early Greek papyri contained sections and often lists of items. In 10a 159, a 15th century Italian manuscript which includes Macer Floridus’ De virtutibus herbarum, the section headings are listed in the back of the volume.
Each section of De virtutis herbarum is headed with a rubricated title and chapter number. These titles and chapter numbers are listed in the back, followed by the folio number on which they can be found.
And in case the reader may not be familiar with such lists, Christoforus (our scribe; see the previous post here) provides an explanation:
Rubrica.
Hec sunt capitula designata quibus / potest sciri in quo capitulo sit / nomen cuiuslibet herbe. Unde / videndum est quod capitulum / tractet de ipsis herbis que continetur in hoc libro.
Basically, the chapter titles are the names of the herbs. Nice and simple.