- Who Was Giovanni Battista della Porta and Why Do His Books Matter?
- Where to Find His Major Works in Digital Form
- Modern Print Editions and Translations
- How to Access Rare Manuscripts and Letters
- What His Works Mean for the Occult Tradition
- Comparisons with Contemporary Occult Writers
- Common Misconceptions About Della Porta’s Works
- Where to Begin Your Research
Giovanni Battista della Porta’s works are available through the Internet Archive, Google Books, and the Biblioteca Nazionale di Napoli, with the 1658 English translation of Magia Naturalis being the most accessible single source for English-speaking readers. The 16th‑century Neapolitan polymath wrote foundational texts on natural magic, cryptography, physiognomy, and alchemy that remain essential primary sources for the history of occult philosophy. His most famous book, Magia Naturalis (1558), went through dozens of Latin editions and was translated into Italian, French, English, and Dutch before 1700. Finding his complete works requires knowing which titles matter, where the best digital scans live, and which modern translations are reliable.
Who Was Giovanni Battista della Porta and Why Do His Books Matter?
Della Porta was born in Vico Equense near Naples in 1535, the second son of a noble family. By age fifteen he had written his first book, De Magia Naturali, which he later expanded into the Magia Naturalis that made him famous. In 1560 he founded the Accademia dei Segreti (Academy of Secrets), a private society where members brought unknown facts about nature to share. The academy was short‑lived: the Inquisition investigated della Porta in the 1570s, and he was forced to disband it. He never faced trial, but the episode taught him to frame his magic as “natural” rather than demonic.
His books mattered because they collected practical recipes and observations from classical sources, medieval experimenters, and his own tests. He described the camera obscura, the thermoscope (a primitive thermometer), the properties of magnets, the distillation of essential oils, and dozens of tricks for making invisible ink, changing the color of flowers, or creating “sympathetic” powders. For occult readers, his work preserved the doctrine of signatures, the theory of sympathies and antipathies, and the art of physiognomy. He was cited by Francis Bacon, Robert Boyle, Isaac Newton, and John Dee.
Where to Find His Major Works in Digital Form
The best single source for della Porta’s Latin editions is the Biblioteca Nazionale di Napoli digital collection, which holds several of his first editions. The Internet Archive and Google Books host most of his major titles. The key works and their most accessible digital locations are listed below.
Magia Naturalis (1558, expanded 1589)
The foundational text. The 1589 edition in twenty books is the standard version. Internet Archive has a complete scan of the 1650 English translation titled Natural Magick (London: Thomas Young and Samuel Speed). This English edition is the most widely used by English‑speaking occultists. The Latin original is available on Google Books from the 1597 Frankfurt edition.
De Furtivis Literarum Notis (1563)
The first systematic European work on cryptography. Della Porta invented the digraphic cipher and described techniques for hiding messages in music, drawings, and even the patterns of lice on a person’s body (a method he claimed was used by prisoners). A 1591 edition is on Google Books. A modern English translation by the Cryptologia journal exists but is hard to find outside academic libraries.
De Humana Physiognomonia (1586)
The most influential physiognomy book of the Renaissance. Della Porta compared human faces to animal faces to argue that character could be read from features. The book is filled with woodcut illustrations. Internet Archive has the 1593 Latin edition and a 1598 Italian translation. No complete English translation exists, but excerpts appear in Renaissance physiognomy anthologies.
Villae (1592)
A twelve‑book treatise on agriculture, gardening, and rural magic. It includes instructions for making wine, preserving fruit, and using astrological timing for planting. The Latin text is on Google Books. A partial Italian translation is available on the Biblioteca Italiana website.
De Aeris Transmutationibus (1610)
A short work on the transformation of air, dealing with weather magic and the generation of winds. It is rare. The only digital copy known is on the Bayerische Staatsbibliothek (Munich) digital library.
De Miraculis Rerum Naturalium (1597)
A collection of “miracles” of nature, including discussions of vampires, werewolves, and the basilisk. Della Porta treated these as natural phenomena, not supernatural. The book is on Internet Archive in a 1601 edition.
Modern Print Editions and Translations
Digital scans are free but often lack readable type or modern apparatus. For serious study, these print editions are recommended:
- Natural Magick (1658 English translation, facsimile reprint by Basic Books, 1957). Still the most affordable way to own the full English text. Out of print but widely available used.
- Giambattista della Porta: Natural Magic (edited by John Baptista Porta, Kessinger Publishing, 2003). A reprint of the 1658 edition, inexpensive but poorly scanned.
- De Humana Physiognomonia (Italian edition by Edizioni dell’Orso, 2010). The best modern critical edition, with commentary.
- Cryptography: De Furtivis Literarum Notis (English translation by James A. Reeds, American Cryptogram Association, 1998). A limited run; check university libraries.
No complete modern English translation of Magia Naturalis exists. The 1658 translation is archaic but readable. It is adequate for most research.
How to Access Rare Manuscripts and Letters
Della Porta’s correspondence and unpublished manuscripts are scattered across European archives. The Biblioteca Nazionale di Napoli holds the largest collection of his letters. The Vatican Library has several of his autograph manuscripts, including a draft of De Magia Naturali with his own corrections. The British Library has a copy of his unpublished play L’Olimpia. For researchers, the best starting point is the Della Porta Archive at the University of Salerno, which maintains a database of his works and locations.
What His Works Mean for the Occult Tradition
Della Porta’s “natural magic” was not ceremonial or demonic. He insisted that all his effects came from hidden but natural causes: the sympathy between a magnet and iron, the antipathy between a diamond and a goat’s blood, the power of imagination to shape matter. This framework influenced later occultists who wanted to practice magic without invoking spirits. His physiognomy became a standard reference for Renaissance astrologers and alchemists who read character from the face. His cryptographic work was used by secret societies and diplomatic agents.
The concrete practice: in Magia Naturalis Book 8, he describes how to make a “sympathetic ink” that appears only when heated. The recipe calls for alum, vinegar, and a quill. It works. That is the kind of knowledge della Porta preserved: not theory, but a recipe that a reader can perform.
Comparisons with Contemporary Occult Writers
Della Porta is often grouped with Heinrich Cornelius Agrippa and Paracelsus, but the comparison is misleading. Agrippa’s Three Books of Occult Philosophy (1533) is a theoretical synthesis of Neoplatonic magic. Paracelsus wrote in a dense, alchemical jargon. Della Porta wrote clear, practical prose aimed at a literate lay audience. He was closer to the tradition of the “books of secrets” that circulated in Italy, such as Alessio Piemontese’s Secreti (1555). His work is less philosophical than Agrippa’s but more reproducible.
Later, Athanasius Kircher (1602–1680) continued della Porta’s project of cataloging natural wonders, but Kircher added elaborate allegorical interpretations. Della Porta kept his explanations brief. For a reader who wants to try the experiments, della Porta is the better guide.
Common Misconceptions About Della Porta’s Works
Misconception 1: He was a witch or magician who summoned demons. Della Porta explicitly rejected demonic magic. In the preface to Magia Naturalis he writes that “magic is nothing else but the survey of the whole course of nature.” The Inquisition investigated him, but he was never convicted.
Misconception 2: His books are rare and impossible to find. The opposite is true. Because his works were printed in multiple editions across Europe, they survive in hundreds of libraries. Most are digitized.
Misconception 3: Magia Naturalis is a single book. It grew from four books in 1558 to twenty books in 1589. Later editions added appendices. The English translation of 1658 is based on the twenty‑book edition but omits some chapters.
Misconception 4: His physiognomy is entirely pseudoscientific. While modern science rejects face‑reading, della Porta’s method was based on systematic observation and comparison. He collected hundreds of examples and tried to find patterns. It is a precursor to comparative anatomy, not just superstition.
FAQ
Where can I read Magia Naturalis in English for free?
The 1658 English translation Natural Magick is on the Internet Archive in full. Search for “Natural Magick della Porta 1658.”
Are any of della Porta’s works still in print?
Yes. Kessinger Publishing and other reprint houses sell facsimiles of the 1658 translation. The Italian critical edition of De Humana Physiognomonia is also in print.
What is della Porta’s most important book for occult practitioners?
Magia Naturalis is the essential text. It contains the most practical recipes and the clearest statement of his natural magic philosophy.
Where to Begin Your Research
Start with the 1658 English Natural Magick on the Internet Archive. Read Book 1 for his definition of magic, then skip to Book 8 for the experiments. That will give you the flavor of his work. If you want to go deeper, the Latin editions on Google Books allow you to check his original phrasing. For the cryptographic work, the De Furtivis is a masterpiece of early information theory.
Della Porta’s works are not relics. They are living documents that connect the laboratory to the grimoire. A copy of Natural Magick sits next to the natural magic section of the library, and it is consulted whenever a recipe that actually works is needed. For the theory behind his methods, see the glossary of physiognomy. And for a deeper exploration of how Renaissance occultists used his ideas, read the guide on the Accademia dei Segreti and its legacy. Those interested in the darker applications of natural magic may also find value in the necromancy hub, which traces how della Porta’s principles of sympathy and antipathy were adapted for spirit communication.