At the end of this chapter, Nick sees Gatsby on the lawn and is about to call to him and introduce himself, but he does not. What stops Nick? What does Gatsby's "trembling" suggest?

Nick stops his action because as he observes Gatsby from the distance he notices it is a private moment for Gatsby as he trembles when observing a green light through the water close to Daisy's house, therefore he does not feel comfortable to interrupt the moment for his neighbor.

Explanation:

At the end of The Great Gatsby the famous novel written by the North-American author F. Scott Fitzgerald, it is possible to see how Nick has a real interest to present himself to the famous, mysterious and millionaire Gatsby, however he notices there is something really personal happening through his mind at that moment. Nick can see from the distance how Gatsby is in a deep thinking moment as he stretches his arms towards the water with his trembling body, which looks like an intimate moment, a moment after Gatsby simply disappears and Nick finds himself alone again.