|French: Matinée de Septembre|
|Dimensions||163.8 cm × 216.5 cm (64.5 in × 85.2 in)|
Matinée de Septembre (English: September Morn) is a controversial
September Morn was first exhibited at the
From 1913 on, reproductions of the painting caused controversy in the United States. An art dealer in
Although several women claimed to be the model for September Morn, Chabas never revealed her identity. He described the work as "all I know of painting",
 and responded positively to statements that it was his masterpiece. Later writers, however, have described the painting as
September Morn depicts, from an oblique point of view, a naked blonde girl or young woman standing ankle-deep in the water near the shoreline of a tranquil lake surrounded by hills. The figure is backlit by the morning sun, but fully visible, if a little darker than her surroundings.
 Her arms are folded about her body, her right arm passing below her breasts as she grasps her left elbow, while her left arm conceals her pubic area.
 This pose has been variously interpreted as the subject protecting herself from the cold,
 covering her modesty,
Reviews in 1912 noted that the painting was dominated by grays: those of her shaded body, the blue-grays of the September water, the green-grays of the sky, and the pink-grays of the hills behind her.
 The art critic François Thiébault-Sisson described this as evoking the morning, the young subject preparing to bathe while "light grey vapours are still floating over the lake".