1903
- April 15: The General Netherlands Chemical Society (Algemene Nederlandsche Chemische Vereeniging) is founded. The association has 113 members. The membership fee is 7.50 guilders. The initiators are fellow chemists Willem Jorissen, Jan Rutten, and Lodewijk Reicher.
- July 4: The association is renamed the Nederlandse Chemische Vereeniging (NCV). Ernst Julius Cohen becomes the very first chairman.
- October 3: The first edition of Chemisch Weekblad, the official organ of the NCV, is published. Willem Jorissen remains the editor until 1939.