The work is conceived as a series of tree diagrams ('alberi') and short paragraphs which aim at summarising the main rational faculties (grammar, rhetoric, topics, logic, poetics, history). Aristotle is one of the main sources employed by Toscanella, who regularly refers to him, especially when dealing with rhetorical issues. Nonetheless, the renown school master turns to more recent sources as well: among them, the Dutch scholar Cornelius Valerius (to whom Toscanella refers to in the sections devoted to logic) stands out.
TOSCANELLA Orazio
AVANZI Ludovico
Eugenio Refini
1567—TOSCANELLA Orazio—Precetti necessarii
1562—TOSCANELLA Orazio—Precetti necessarii
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