Jack London has a strong belief in Darwinism, survival of the fittest, during the late 1800's through the early 1900's, when he wrote. Throughout his writings, many characters display London's belief in Darwinism. In the novel, The Call of the Wild, Jack London's belief in the Darwinian Jungle is portrayed by animals interacting with humans, each other, and the environment. This can be shown through Buck, a house dog turned sled dog, interacting with his masters, other dogs, and the Yukon wilderness. As Buck travels from master to master t ....