What did Zola, the founder of French naturalism, write in "Naturalism in Drama"?

Painting style photography blindly imitates the effects of painting art, but ignores its own artistic characteristics, and inevitably goes astray in its creative methods. For photography, people still want to see real and natural effects. Zola, the founder of French naturalism at that time, wrote in the article "Naturalism in Drama": Naturalism means returning to nature. It is advocated that the artist should be a recorder of facts and a pure naturalist.