In Chapter 18 of The Cay by Theodore Taylor, what is the tone at the end of the chapter, and how does Philip feel?

After Timothy dies, Phillip and Stew Cat are left alone on the island. During Chapter Eighteen, Phillip hears some explosions and then an aircraft nearby. He grabs some matches and runs down to the fire pile on the beach. After a few tries, he is able to light the fire and signal to the plane. Unfortunately, the plane circles and then leaves. The tone at the end of Chapter Eighteen is depressed and pessimistic. Phillip...

After Timothy dies, Phillip and Stew Cat are left alone on the island. During Chapter Eighteen, Phillip hears some explosions and then an aircraft nearby. He grabs some matches and runs down to the fire pile on the beach. After a few tries, he is able to light the fire and signal to the plane. Unfortunately, the plane circles and then leaves. The tone at the end of Chapter Eighteen is depressed and pessimistic. Phillip feels like he will never be rescued, and he is both sad and angry. He thinks that the pilot probably mistook him for a native because his skin is much darker from all of his time on the island in the sun. This causes Phillip to lose hope.

"Feeling very ill, I climbed the slope again, throwing myself down on the mat in the hut. I didn't cry. There was no use in doing that" (Taylor 131).

Phillip also tells us that he wishes Timothy had taken him with Timothy to the grave. He is so disappointed that he no longer wants to live.