A Quarrel between the Mayors of Amsterdam and the Nuns of St Mary Magdalen ‘or we shall destroy your vaulted ditch under the street’. Guest author • November 06, 2016
ABC for the advanced: the trompe l'oeil booklet of Cryn van Zuyderhoudt Those who look closely will find many treasures in this book. Guest author • August 23, 2016
A heartbeat from 1881 Einthoven already experimented with detecting the human heartbeat during his study in Utrecht. Mart van Duijn • August 01, 2016
Neglect of duty by a Batavian naval officer "Do I travel to The Hague to lose my health in some cell, or do I flee to Britain which will probably raise the hateful suspicions even more?" Erik-Jan Dros • June 07, 2016
Van Eeden visiting Busken Huet Friends at the dining table, rivals in literature dispute. Guest author • January 18, 2016
An album from Gorcum with a Leiden touch The recently purchased album amicorum of Charlotte Johanna Kneppelhout (1779-1842) is an album from Gorcum, but with a Leiden touch. Mart van Duijn • December 22, 2015
No Third of October Feast without its Programme! October 3rd merry chaos in Leiden. Anton van der Lem • October 03, 2015
Tracing Dispersed Notes in a Manuscript by Ademar of Chabannes Creative re-use of available parchment. Guest author • September 04, 2015
A New Discovery in an Old Astronomy Book One of the annotations reveals awareness for a faster calculation of sines known as the ‘Ingenious Way’ (Artificium). Guest author • April 07, 2015
