batch of paintings from Arles sent to Paris. July 18: Van Gogh has another mental breakdown, lasting until the end of August. September: Van Gogh takes up work again. September 3: Opening of the 5th exhibition of the Artistes Indépendants, running through October 4; Van Gogh contributes 2 paintings. November 15: Octave Maus, secretary of Les XX, invites Van Gogh to participate in their forthcoming 7th annual exhibition in February 1890; Van Gogh accepts. 1890 January 18: Opening of the 7th annual exhibition of Les XX, Brussels, running through February 23; Van Gogh contributes 6 paintings, one of them is sold to Anna Boch. At the dinner, Henry de Groux insults van Gogh's paintings and refuses to allow his work to be displayed alongside Van Gogh's; Toulouse-Lautrec challenges de Groux to a duel in Van Gogh's defense, and Signac declares that he would continue in Van Gogh's defense if Lautrec should be killed. De Groux is subsequently expelled from les XX. January 31: Theo's son Vincent Willem van Gogh is born. February 22–23: while on a visit to Arles, Van Gogh falls ill and has to be brought back to Saint-Rémy on a carriage. This crisis, lasting about nine weeks until the last days of April, is the longest recorded. March 20: Opening of the 6th exhibition of the Artistes Indépendants, running through April 27; Van Gogh contributes 10 paintings, 5 of which have already been shown at Les XX in Brussels. Gauguin, Armand Guillaumin and other colleagues propose to exchange works; Monet sends his congratulations. May 1: recovered, he has taken up work again. May 3: Vincent writes to Theo accepting his suggestion that he move back to Paris. early May: Vincent contacts friends announcing his departure from Saint Rémy and, in preparation, begins giving paintings away. May 16: Vincent is discharged from Saint Rémy, he travels to Paris, arrives May 17, at 10 in the morning. May 17–20: stays with Theo in Paris. May 20: moves to Auvers-sur-Oise. June 8: Theo and family visit. early July: Theo and Jo's son falls ill. July 6: makes a day trip to Paris to see Theo, Jo and his sick nephew; arguments ensue. July 15: Theo accompanies his wife and son to the Netherlands, travelling via Antwerp. July 19: Theo returns to Paris alone, leaving his wife and child in the Netherlands for a holiday. July 23: business forces Theo out