4. Henry Degroux, Charles’s son, was a member of the Belgian society of artists Les Vingt. As such he objected to Van Gogh’s participation in Les Vingt’s seventh Salon in 1890. He withdrew his own entry, ‘not wishing, as far as I am concerned, to find myself in the same room as the laughable vase of sunflowers by Mr Vincent, or by any other
agent provocateur’ (ne voulant pas quant à moi, me trouver dans la même salle que l’inénarable [
sic] pot de soleils de monsieur Vincent, ou de tout autre agent provocateur) as he wrote to
Octave Maus. Les Vingt subsequently voted to exclude Degroux. See exhib. cat. Brussels 1993, p. 51.