Quote 40
But he is not always alone. When the long winter nights come on and the wolves follow their meat into the lower valleys, he may be seen running at the head of the pack through the pale moonlight or glimmering borealis, leaping gigantic above his fellows, his great throat a-bellow as he sings a song of the younger world, which is the song of the pack. (7.50)
London ends the novel with a description of Buck, but equally important, of the world Buck has chosen to join.
Quote 41
His eyes turned blood-shot, and he was metamorphosed into a raging fiend. So changed was he that the Judge himself would not have recognized him (1.25)
Buck’s first changes are the result of his anger.
Quote 42
Buck learned easily, and under the combined tuition of his two mates and François made remarkable progress. (2.5)
Buck’s ability to learn enables him to survive in the North.