Procession (cortège) of professors on the Dies (Natalis) of Leiden University with H.A. Lorentz, 8 February 1925. Lorentz is wearing the regalia of an honorary doctorate.
Unknown author<span style="display: none;">Unknown author</span>
Berends, Frits en van Delft, Dirk: Lorentz: gevierd fysicus, geboren verzoener, Prometheus, Amsterdam 2019. Scanned photograph, ultimate source Rijksmuseum Boerhaave, Leiden, the Netherlands