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Edited by Andre Bouwman

Codices Hugeniani Online (COHU) offers the fully digitized archive of Christiaan Huygens (1629 - 1695), held at Leiden University Library. The archive includes notebooks and loose leafs with texts in the field of astronomy, mechanics, mathematics and music, as well as correspondence and annotated books.

Huygens was a prominent Dutch mathematician, astronomer and physicist. He published major studies on mechanics and optics, and a pioneer work on games of chance. He is famous for his discovery of the rings of Saturn and its moon Titan, and for inventing the pendulum clock.

Shortly before his death in 1695 Huygens bequeathed a large part of his scholarly papers to Leiden University Library. After 1800, the legacy was further enriched by manuscripts and letters from family property, amongst others a large number of letters from Huygens' father Constantijn (1596 - 1687).

For over three centuries, many scholars have made the Codices Hugeniani the object of their research. The contents of the archive have been made partly accessible through the well-known Oeuvres complètes (a 19-volume 19th Century reference work). More recently, the Codices Hugeniani were described in detail by Dr. Joella Yoder in her Catalogue of the Manuscripts of Christiaan Huygens (Brill, 2013). With COHU the full archive's contents are now easily accessible for the first time.

Features and benefits

Sections COHU is logically organized in the same way as the original archive, i.e. 52 codices as main entrances, enabling an overview of the archive as a whole.

Advanced search options In each codex the scans are offered in smaller groupings ranging from 1 to several dozen folios each. These groupings are all described with detailed metadata. This offers the possibility of an advanced search for specific topics, etc.

Rich metadata
For a large part the metadata are taken from Joella Yoder’s catalogue. This is the most authoritative overview and the outcome of 20+ years of hard work. The book contains valuable information about the archive that is not in the Leiden University Library's catalogue.

Direct link between famous Oeuvres complètesand archive
The COHU metadata offer a concordance between the physical archive and the Oeuvres complètes.

Anti-Calvin Online

The Catholic Response to Calvin's Writings in Sixteenth-Century France

• Number of titles: 94
• Languages used: French
• Title list available
• MARC records are available

During the sixteenth century Protestant authors had grasped the importance of winning over the souls and minds of the French people from the outset and the production of Genevan presses was therefore predominantly in French. If the Catholic Church wished to preserve its position in France, it was vital to respond to the gauntlet thrown down by the Calvinist leaders. It is this response, the writings of the French Catholic authors against Calvin and his teachings, that are presented here. This unique selection of writings includes both works attacking the precepts of Calvinism and those defending the Catholic doctrine against the criticism and condemnation of Calvinist authors.

Location of originals: Bibliothèque de Toulouse, Bibliothèque Mazarine, Paris; Bibliothèque Méjanes, Aix-en-Provence; Bibliothèque municipale de Bordeaux; Bibliothèque municipale de Lyon; Bibliothèque municipale de Nancy; Bibliothèque municipale de Nîmes; Bibliothèque municipale de Reims; Bibliothèque nationale de France, Paris; Bibliothèque Sainte-Geneviève, Paris; Médiathèque Ceccano, Avignon; Médiathèque de la ville de Rodez; Médiathèque du Pontiff roy, Metz; Universiteitsbibliotheek Katholieke Universiteit Leuven; Bayerische Staatsbibliothek, München; Bibliothèque de Genève, Genève; Institut d’histoire de la Réormation, Genèe; British Library, London; Palace Green Library, Durham University
• Languages used: English, German, French, Italian, Latin • MARC records are available Accounts of travel are a popular and accessible source for research on historical relations between “East” and “West” and are attractive for specialists and non-specialists alike. In the pre-modern period a large number of such accounts were published all over Europe. Predominantly covering the Ottoman Empire, the collection also stretches into Ethiopia, Central Asia, Afghanistan, North Africa, and of course Iran.