How did the main character change story the open window

Mr.Nuttel is staying in the country in order to take a "rest cure." He is suffering from a nervous disorder and, as he tells Mrs. Sappleton, "The doctors agree in ordering me complete rest, an absence of mental excitement, and avoidance of anything in that can exhaust him.

The bird symbolizes loneliness, which Mrs. Wright endured throughout her marriage to Mr. Wright