PORTA, GIOVANNI BATTISTA DELLA. Magiae Naturalis libri XX. Naples: Orazio Salviani, 1589. Woodcut title-border with portrait of the author on verso, numerous woodcut illustrations and diagrams in text. Folio, modern quarter morocco; some browning and spotting to text, internal triangular chip on X4 (affecting a few letters). FIRST EDITION of the twenty books. Riccardi I(2), 307; Mortimer/Italian 400; see Honeyman VI, 2519 ("An expanded version of the 1558 edition, and one of the most popular sixteenth-century books on science").