How do cats figure in Cannery Row?

Does the lonely bachelor gopher at the end of the novel say anything about the human relationships portrayed?

Why would Doc read from "Black Marigolds" at his birthday party?

What does the passing mention of "tong wars" say about Lee Chong's character? Does it fit his general depiction? Why would Steinbeck include this tidbit?

Is Mack truly a philosopher? If so, what is his philosophy? If not, what is he and why would learned Doc call him one?

How is suicide dealt with in the novel?

How is luck dealt with in the novel?