Portret van Charles-Louis-Joseph-Xavier de la Vallée Poussin before 1903

This anonymous portrait depicts Charles-Louis-Joseph-Xavier de la Vallée Poussin, a Belgian mathematician and astronomer. The black and white photograph shows him with a distinguished demeanor, sporting a mustache and wearing a dark suit. It is a small portrait, measuring 142 mm in height and 101 mm in width. The image likely dates before 1903, adding historical context to the work. This photograph is likely a part of a collection or an article about De La Vallée Poussin's life and achievements.