See also Melanchthon's earlier rhetorical treatise, Institutiones Rhetorices (1519 or 1521).

Book One
De Officiis Oratoris (A8v-B1r)
     Inventio
     Dispositio
     Elocutio
     Memoria
     Pronunciatio / Actio
Discrimen Dialecticae et Rhetoricae (B1r-B2v)
De Tribus Generibus Caussarum (B2v-B4v, 4 pages)
     Demonstratiuum (laus & vituperatio)
     Deliberatiuum (suadendo & dissuadendo)
     Iudicale (controversias forenses)
     Didascalico (which he adds from Dialectic and is of ecclesiastical value)
Ad Quid Conducat Nosse Genus Causae (B4v-B6v)
De Genere Didascalico (B6v-C1r)
     (This category, derived from Dialectic, is oriented towards proper teaching)

Third Order of Figures: Amplification

Melanchthon innovates an arrangement of figures here by grouping them beneath topics of invention, showing a strong relationship between the topics and the figures.

distributio (merismus)
dialysis
congeries (synathroesmus)
incrementum