DELLA PORTA, Giambattista (1535-1615). Magiae Naturalis Libri Viginti? Frankfurt: Andreae Wechel, 1597. 12mo in sixes (6 x 4?). Illustrated. Bound in later quarter crushed brown morocco over marbled boards, spine stamped in blind and gilt, 3 raised bands, later endleaves. Binding worn, hinges cracked, text toned, worn, chipped, several leaves with biopredation, final blank with ink notes. A good copy of this rare book, Porta?s second version of this work, complete in 20 books on various topics, including the origin of species, the preparation of food, medical remedies, and invisible writing.