What page is this Grapes of Wrath quote on?

Explain the quote from Grapes of Wrath?

• This is in chapter 21 page 284 (in my book) "And the anger began to ferment." What exactly does that mean, yes I know it relates to the title considering it's Grapes of Wrath and when grapes ferment they turn into wine but I don't understand how this applies to this chapter or even what it means. Please help?

• Answer:

  Chapter 21 The hostility directed toward the migrants changes them and brings them together. Property owners are terrified of “the flare of want in the eyes of the migrants.” California locals form armed bands to terrorize the “Okies” and keep them in their place. The owners of large farms drive the smaller farmers out of business, making more and more people destitute and unable to feed themselves or their children. Tom and Casy begin to express this devotion in more overtly political ways and with a sense of often violent outrage. The incident surrounding Floyd Knowles and the fruit-picking contractor signifies the beginning of the two men’s involvement in the burgeoning movement to organize migrant labor, to protect workers against unfair treatment and unlivable wages. Although the men have always possessed a sense for injustice, they do not act on their convictions until they witness Floyd Knowles’s impassioned speech against unfair labor practices. "And the anger began to ferment." There is a slow build-up (fermentation) of anger and frustration against the situation people find themselves in. You already see the play on words with 'ferment' and the title of the book. http://www.sparknotes.com/lit/grapesofwrath/context.html