The first chapter of The Call of the Wild is entitled "Into the Primitive." What's the significance of this title?

The significance of this title tells about Buck's experience with the man in the red sweater. Buck is firmly beaten and humiliated by the man, but learned a valuable lesson. He learned that might makes right in this strange new area. That rule becomes a law to Buck. He calls it the "primitive law," and throughout the book Buck learns how that rule affects him, other dogs, and his owners.